$BTU
PEABODY ENERGY CORP Stock $btu

$btu Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000106472813000014 Filed on February 25, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$2.230B	$1.981B	$1.962B
YoY Change	24.38%	8.43%	20.36%
Cost Of Revenue	$1.519B	$1.399B	$1.312B
YoY Change	36.71%	12.56%	11.7%
Gross Profit	$710.9M	$581.2M	$630.3M
YoY Change	37.9%	-6.47%	29.5%
Gross Profit Margin	31.88%	29.34%	32.13%
Selling, General & Admin	$86.10M	$71.20M	$58.60M
YoY Change	2.26%	31.61%	-9.85%
% of Gross Profit	12.11%	12.25%	9.3%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$156.7M	$108.4M	$104.1M
YoY Change	53.33%	-7.11%	-0.95%
% of Gross Profit	22.04%	18.65%	16.52%
Operating Expenses	$242.8M	$71.20M	$58.60M
YoY Change	30.26%	31.61%	-65.55%
Operating Profit	$418.2M	$385.5M	$479.4M
YoY Change	28.16%	-13.82%	47.19%
Interest Expense	-$82.50M	$59.20M	$48.90M
YoY Change	60.19%	-4.82%	-198.0%
% of Operating Profit	-19.73%	15.36%	10.2%
Other Income/Expense, Net
YoY Change
Pretax Income	$345.9M	$330.4M	$433.9M
YoY Change	18.42%	-14.25%	61.84%
Income Tax	$124.4M	$39.20M	$126.1M
% Of Pretax Income	35.96%	11.86%	29.06%
Net Earnings	$222.4M	$274.0M	$284.8M
YoY Change	5.9%	22.27%	38.12%
Net Earnings / Revenue	9.97%	13.83%	14.52%
Basic Earnings Per Share		$1.01	$1.05
Diluted Earnings Per Share	$823.5K	$1.00	$1.05
COMMON SHARES
Basic Shares Outstanding	269.3M shares	269.2M shares	269.0M shares
Diluted Shares Outstanding	270.2M shares	270.6M shares	270.5M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$799.0M	$1.402B	$1.252B
YoY Change	-38.3%	2.49%	8.21%
Cash & Equivalents	$799.1M	$1.402B	$1.177B
Short-Term Investments			$75.00M
Other Short-Term Assets	$768.0M	$503.2M	$840.0M
YoY Change	64.42%	-11.41%	101.92%
Inventory	$444.4M	$351.9M	$374.0M
Prepaid Expenses
Receivables	$922.5M	$591.4M	$645.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.006B	$3.005B	$3.110B
YoY Change	1.61%	3.09%	33.48%
LONG-TERM ASSETS
Property, Plant & Equipment	$11.25B	$7.808B	$7.584B
YoY Change	54.91%	8.16%	4.66%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$526.6M	$879.0M	$1.051B
YoY Change	19403.7%	4.89%	101.73%
Other Assets	$2.476B	$878.5M
YoY Change	141.09%
Total Long-Term Assets	$13.73B	$8.687B	$8.636B
YoY Change	63.32%	7.8%	11.17%
TOTAL ASSETS
Total Short-Term Assets	$3.006B	$3.005B	$3.110B
Total Long-Term Assets	$13.73B	$8.687B	$8.636B
Total Assets	$16.73B	$11.69B	$11.75B
YoY Change	47.26%	6.55%	16.32%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$736.0M	$1.335B	$1.336B
YoY Change	-42.9%	1.29%	21.34%
Accrued Expenses	$9.000M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$101.0M	$44.00M	$44.00M
YoY Change	134.88%	4.76%	25.71%
Total Short-Term Liabilities	$1.824B	$1.441B	$1.486B
YoY Change	20.48%	2.15%	22.2%
LONG-TERM LIABILITIES
Long-Term Debt	$6.556B	$2.459B	$2.468B
YoY Change	142.19%	-9.43%	-9.53%
Other Long-Term Liabilities	$645.6M	$466.7M	$1.949B
YoY Change	42.33%	-74.36%	4.62%
Total Long-Term Liabilities	$645.6M	$466.7M	$4.417B
YoY Change	42.33%	-89.71%	-3.79%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.824B	$1.441B	$1.486B
Total Long-Term Liabilities	$645.6M	$466.7M	$4.417B
Total Liabilities	$11.22B	$6.369B	$6.530B
YoY Change	68.08%	-2.3%	6.3%
SHAREHOLDERS EQUITY
Retained Earnings	$3.744B	$3.545B
YoY Change	30.07%
Common Stock	$2.234B	$2.231B
YoY Change	2.38%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$353.3M	$350.7M
YoY Change	5.59%
Treasury Stock Shares	9.200M shares	9.168M shares
Shareholders Equity	$5.485B	$5.289B	$5.215B
YoY Change
Total Liabilities & Shareholders Equity	$16.73B	$11.69B	$11.75B
YoY Change	47.26%	6.55%	16.32%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$222.4M	$274.0M	$284.8M
YoY Change	5.9%	22.27%	38.12%
Depreciation, Depletion And Amortization	$156.7M	$108.4M	$104.1M
YoY Change	53.33%	-7.11%	-0.95%
Cash From Operating Activities	$442.7M	$574.9M	$395.0M
YoY Change	127.14%	34.39%	35.0%
INVESTING ACTIVITIES
Capital Expenditures	-$294.0M	-$235.0M	-$224.8M
YoY Change	15.43%	126.4%	126.84%
Acquisitions
YoY Change
Other Investing Activities	-$2.757B	-$82.00M	-$3.800M
YoY Change	10669.53%	-4.43%	-82.65%
Cash From Investing Activities	-$3.051B	-$317.0M	-$228.6M
YoY Change	988.48%	67.19%	88.93%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	2.006B	-33.20M	-262.7M
YoY Change	15211.45%	19.86%	556.75%
NET CHANGE
Cash From Operating Activities	442.7M	574.9M	395.0M
Cash From Investing Activities	-3.051B	-317.0M	-228.6M
Cash From Financing Activities	2.006B	-33.20M	-262.7M
Net Change In Cash	-602.5M	224.7M	-96.30M
YoY Change	733.33%	6.75%	-173.18%
FREE CASH FLOW
Cash From Operating Activities	$442.7M	$574.9M	$395.0M
Capital Expenditures	-$294.0M	-$235.0M	-$224.8M
Free Cash Flow	$736.7M	$809.9M	$619.8M
YoY Change	63.86%	52.35%	58.23%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011	btu	Operating Costs And Expense OperatingCostsAndExpense	5477600000	USD
CY2012Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	1606900000	USD
CY2011Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	1712300000	USD
CY2011Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	735600000	USD
CY2012Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	555000000	USD
CY2012Q4	us-gaap	Accounts Receivable From Securitization AccountsReceivableFromSecuritization	25000000	USD
CY2011Q4	us-gaap	Accounts Receivable From Securitization AccountsReceivableFromSecuritization	150000000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	737800000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	922500000	USD
CY2011	us-gaap	Accretion Expense AccretionExpense	28300000	USD
CY2012	us-gaap	Accretion Expense AccretionExpense	34300000	USD
CY2011Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	210500000	USD
CY2012Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	203800000	USD
CY2012Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	10600000	USD
CY2011Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	11600000	USD
CY2012Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	82300000	USD
CY2011Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	77800000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3320400000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3629500000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	300000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-6700000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	387500000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	335700000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	167300000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	294800000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	22200000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	3100000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	3100000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	3100000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-142400000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	11000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-67900000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-183500000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2234000000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	-2286300000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	43900000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	45400000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	41100000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	-51000000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	-8100000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	17000000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	13700000	USD
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1200000	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	687500000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	615200000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	484900000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	67000000	USD
CY2010	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	45900000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	52600000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	43000000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	13600000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	12800000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	8700000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	67700000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	37200000	USD
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CY2011Q4	us-gaap	Assets Assets	16733000000	USD
CY2010Q4	us-gaap	Assets Assets	11363100000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	3005900000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	2575500000	USD
CY2011Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	256800000	USD
CY2012Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	178300000	USD
CY2012Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Noncurrent AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	140800000	USD
CY2011Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Noncurrent AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	232200000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	83500000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	88400000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	94100000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	88000000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1600000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	100000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	10900000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	0	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	300000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	400000	USD
CY2012Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	1321300000	USD
CY2011Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	1084200000	USD
CY2012	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2011	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	85200000	USD
CY2010	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2011Q4	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	76100000	USD
CY2011Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	9100000	USD
CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
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CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-51200000	USD
CY2011Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	122800000	USD
CY2012Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	104600000	USD
CY2012Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	162500000	USD
CY2011Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	177200000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	125400000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	42200000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	10900000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	11100000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	11200000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	26600000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	23400000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	20800000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	104600000	USD
CY2012Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	83300000	USD
CY2011Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	46600000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	799100000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	558800000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	988800000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1295200000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-496100000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	306400000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-240300000	USD
CY2010	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-10900000	USD
CY2011	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-70600000	USD
CY2012	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-22000000	USD
CY2010	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-17400000	USD
CY2012	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-84700000	USD
CY2011	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-18900000	USD
CY2012Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights	27.50
CY2011	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	7013000000	USD
CY2010	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	6139600000	USD
CY2012	us-gaap	Coal Products And Services Revenue CoalProductsAndServicesRevenue	7041700000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.340
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.295
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.340
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	800000000	shares
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	270200000	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	271100000	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	268600000	shares
CY2009Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	268200000	shares
CY2012	us-gaap	Common Stock Voting Rights CommonStockVotingRights	one vote per share
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-432300000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	883200000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	889600000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-11400000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	28200000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	10600000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	871800000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-421700000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	917800000	USD
CY2012	us-gaap	Costmethod Investments Other Than Temporary Impairment CostmethodInvestmentsOtherThanTemporaryImpairment	39400000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	116800000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	103400000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	113900000	USD
CY2010	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	78800000	USD
CY2011	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	58900000	USD
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	127600000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	256600000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	174500000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	193700000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12200000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12200000	USD
CY2012Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	6252900000	USD
CY2011Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	6657500000	USD
CY2012Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	732500000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-32700000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	138000000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	46300000	USD
CY2010	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	68100000	USD
CY2011	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	42800000	USD
CY2012	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	28800000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	188700000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	120000000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5700000	USD
CY2012	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-2600000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	180600000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	69000000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9600000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7900000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5600000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2854400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1189700000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-520900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-495900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	27300000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	56400000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	955600000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	36100000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	57800000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	56500000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	64700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	53300000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	15700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	15600000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	473300000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	485400000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	137900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	112900000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1893500000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1605800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	37500000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	45500000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	132500000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	132800000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	577300000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	523200000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1318000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1596900000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	500000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	1600000000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear	5000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	769600000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	813700000	USD
CY2012	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities	0.45
CY2012	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities	0.55
CY2012	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Real Estate DefinedBenefitPlanTargetAllocationPercentageOfAssetsRealEstate	0.03
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	429500000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	474300000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	663400000	USD
CY2012Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	278400000	USD
CY2011Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	313800000	USD
CY2012Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	30100000	USD
CY2011Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	240700000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	400000000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	151500000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	384900000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	-4700000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	-1100000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	4800000	USD
CY2012	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	162500000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	652900000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	223600000	USD
CY2012Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	8500000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	11400000	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	9100000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	19500000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-30200000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-163900000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-88800000	USD
CY2010	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	7400000	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	59700000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	22300000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	37500000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	24600000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	27100000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	59600000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	229100000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	200100000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	277500000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	92100000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	79400000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-91900000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.53
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.88
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.19
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.84
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.19
CY2010	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	22200000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	11100000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	9400000	USD
CY2012Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	29600000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition	3.75	years
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15400000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	16300000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	16700000	USD
CY2012	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2011	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2010	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	298600000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	526600000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	8100000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	51000000	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	8300000	USD
CY2011Q4	us-gaap	Financing Receivable FinancingReceivable	376100000	USD
CY2012Q4	us-gaap	Financing Receivable FinancingReceivable	391700000	USD
CY2012	us-gaap	Gain Loss On Disposition Of Property GainLossOnDispositionOfProperty	17100000	USD
CY2010	us-gaap	Gain Loss On Disposition Of Property GainLossOnDispositionOfProperty	29900000	USD
CY2011	us-gaap	Gain Loss On Disposition Of Property GainLossOnDispositionOfProperty	76900000	USD
CY2011	us-gaap	Gain Loss On Sale Of Proved Property GainLossOnSaleOfProvedProperty	31700000	USD
CY2012Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	2271600000	USD
CY2011Q4	us-gaap	Hedging Liabilities Current HedgingLiabilitiesCurrent	7900000	USD
CY2012Q4	us-gaap	Hedging Liabilities Current HedgingLiabilitiesCurrent	5800000	USD
CY2011Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	USD
CY2012Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	4800000	USD
CY2012	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	806700000	USD
CY2012	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	26900000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	796800000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	1024200000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-481500000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	532200000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	818000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1049100000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1376000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1138700000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-208600000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	558000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	606500000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-1257700000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	825000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-470900000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1012800000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	214500000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	122900000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-991300000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	183000000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	306500000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	291200000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	221500000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	193600000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.78
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.96
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-1.80
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.46
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.78
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.65
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.73
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.10
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.05
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.71
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.92
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.92
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.77
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.80
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.73
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.46
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.65
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.78
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-285300000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	104600000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	125000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	0	USD
CY2010	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	29900000	USD
CY2011	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	30400000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.92
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.04
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.70
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.10
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-22800000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-104200000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-66500000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.39
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.25
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.08
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.08
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.39
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.25
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-19200000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1700000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-61200000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	313700000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	262300000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	363200000	USD
CY2010	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-28700000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	15400000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	521500000	USD
CY2012	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-68700000	USD
CY2011	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-99200000	USD
CY2010	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-124500000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-73000000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	399700000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	480800000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-70800000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-53500000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-69400000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	10100000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	21100000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-30200000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	0	USD
CY2010	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	0	USD
CY2012	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-118100000	USD
CY2012	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	9100000	USD
CY2010	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	84500000	USD
CY2011	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	7600000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12300000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1100000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-4800000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	17000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	17800000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	17400000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	275100000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	148400000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	138900000	USD
CY2012	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	46400000	USD
CY2012	us-gaap	Increase Decrease In Due From Related Parties IncreaseDecreaseInDueFromRelatedParties	148000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	83300000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	222900000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-117100000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	221000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	149400000	USD
CY2011	us-gaap	Increase Decrease In Due From Related Parties IncreaseDecreaseInDueFromRelatedParties	371300000	USD
CY2010	us-gaap	Increase Decrease In Due From Related Parties IncreaseDecreaseInDueFromRelatedParties	0	USD
CY2011	us-gaap	Increase Decrease In Due To Related Parties IncreaseDecreaseInDueToRelatedParties	331700000	USD
CY2012	us-gaap	Increase Decrease In Due To Related Parties IncreaseDecreaseInDueToRelatedParties	110800000	USD
CY2010	us-gaap	Increase Decrease In Due To Related Parties IncreaseDecreaseInDueToRelatedParties	0	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	8500000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	50400000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	112900000	USD
CY2012	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-10300000	USD
CY2010	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	28500000	USD
CY2011	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	27400000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-26000000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	21800000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	34800000	USD
CY2010	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	23100000	USD
CY2012	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	38900000	USD
CY2011	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	35400000	USD
CY2011	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	10400000	USD
CY2010	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	-8900000	USD
CY2012	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	9400000	USD
CY2010	us-gaap	Interest Expense InterestExpense	222000000	USD
CY2011	us-gaap	Interest Expense InterestExpense	238600000	USD
CY2012	us-gaap	Interest Expense InterestExpense	405600000	USD
CY2010	us-gaap	Interest Paid InterestPaid	197900000	USD
CY2011	us-gaap	Interest Paid InterestPaid	205300000	USD
CY2012	us-gaap	Interest Paid InterestPaid	396100000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	49700000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	47500000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	444400000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	548400000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	157600000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	123700000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	9600000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	18900000	USD
CY2012	us-gaap	Investment Income Interest InvestmentIncomeInterest	24500000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	129500000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	170600000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	247500000	USD
CY2012Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	79700000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	11217200000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	10870200000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	15809000000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	16733000000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1674100000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1823700000	USD
CY2011Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	123500000	USD
CY2012Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	60400000	USD
CY2012Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	33300000	USD
CY2011Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	63900000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6556400000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6205100000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	101100000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	47800000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	4145100000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	47800000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	9300000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1477900000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	461600000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	111200000	USD
CY2012Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	3162200000	USD
CY2011Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	2857300000	USD
CY2012	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	35500000	USD
CY2011	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	0	USD
CY2010	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	0	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	30700000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	33900000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	7400000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	15900000	USD
CY2010	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5800000	USD
CY2011	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	0	USD
CY2010	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	0	USD
CY2012	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-49800000	USD
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Description of Business</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company is engaged in the mining of thermal coal for sale primarily to electric utilities and metallurgical coal for sale to industrial customers. The Company’s mining operations are located in the United States (U.S.) and Australia, in addition to equity-affiliate mining operations in Australia and Venezuela. The Company also markets and brokers coal from other coal producers, both as principal and agent, and trades coal and freight-related contracts through trading and business offices in China, Australia, the United Kingdom, Germany, Singapore, Indonesia, India and the U.S. The Company’s other energy-related commercial activities include participating in operations of a mine-mouth coal-fueled generating plant, the management of its coal reserve and real estate holdings and the development of Btu Conversion and clean coal technologies. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"></font></div></div>
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-663300000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1678500000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-77100000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1092100000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3807800000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-703600000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1070100000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-692700000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-3737200000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1515100000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1087100000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1633200000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1599800000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1652100000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1104500000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	774000000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	957700000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	-585700000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	172700000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	204700000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	42900000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	-1006000000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	176500000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	222400000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	284800000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	274000000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	28200000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	10600000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-11400000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	768600000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	952800000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-585700000	USD
CY2010	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2012	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2011	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	1994800000	USD
CY2011Q4	us-gaap	Notes Payable Related Parties Noncurrent NotesPayableRelatedPartiesNoncurrent	0	USD
CY2012Q4	us-gaap	Notes Payable Related Parties Noncurrent NotesPayableRelatedPartiesNoncurrent	0	USD
CY2012Q4	us-gaap	Notional Amount Of Foreign Currency Derivatives NotionalAmountOfForeignCurrencyDerivatives	1900000000	AUD
CY2012Q4	us-gaap	Notional Amount Of Interest Rate Derivatives NotionalAmountOfInterestRateDerivatives	0	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	1351100000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	1595700000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	172500000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	266500000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	351300000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	276700000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-722000000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	418200000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	312600000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	385500000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	479400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	677500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	145100000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	81600000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	102300000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	115100000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	130500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	102900000	USD
CY2012Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	372100000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	274000000	USD
CY2012	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	2400000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	768000000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	621700000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	2475500000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1431800000	USD
CY2010	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-2500000	USD
CY2012	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-2200000	USD
CY2011	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-2300000	USD
CY2012	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	7000000	USD
CY2010	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	0	USD
CY2011	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-6700000	USD
CY2012	us-gaap	Other Comprehensive Income Available For Sale Securities Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesTax	4000000	USD
CY2011	us-gaap	Other Comprehensive Income Available For Sale Securities Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesTax	-3900000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	75500000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-11900000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-108700000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-150100000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-41300000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	63400000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	2100000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	-43900000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	51800000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	127500000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	40900000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	-6200000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	129500000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	-3900000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	19100000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	115600000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	153400000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-74500000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-22500000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	900000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	102400000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	251000000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	298600000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-38200000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-31800000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-53200000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	291900000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	229900000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	350400000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	7000000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-6700000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	765500000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	645600000	USD
CY2012Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	33800000	USD
CY2011Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	43400000	USD
CY2012Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	960700000	USD
CY2011Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	1053100000	USD
CY2012	us-gaap	Other Restructuring Costs OtherRestructuringCosts	4300000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	882900000	USD
CY2012	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1035800000	USD
CY2010	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	528600000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	8800000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6200000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6600000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	99900000	USD
CY2012Q2	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	100000000	USD
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	61500000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	32200000	USD
CY2012	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6900000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	79400000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	91900000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	92100000	USD
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2756700000	USD
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2011	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	36200000	USD
CY2010	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	76000000	USD
CY2012	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	10700000	USD
CY2010	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	18800000	USD
CY2012	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	0	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	39700000	USD
CY2011	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	147700000	USD
CY2010	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	74600000	USD
CY2012	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	46700000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	986000000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	546000000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	847400000	USD
CY2012	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	4800000	USD
CY2011	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	100000000	USD
CY2010	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	USD
CY2010	us-gaap	Pension Contributions PensionContributions	112600000	USD
CY2011	us-gaap	Pension Contributions PensionContributions	46700000	USD
CY2012	us-gaap	Pension Contributions PensionContributions	1700000	USD
CY2011	us-gaap	Pension Expense PensionExpense	31100000	USD
CY2010	us-gaap	Pension Expense PensionExpense	23300000	USD
CY2012	us-gaap	Pension Expense PensionExpense	34100000	USD
CY2012	us-gaap	Preferred Stock Call Or Exercise Features PreferredStockCallOrExerciseFeatures	one preferred share purchase right (a Right) that was exercisable if a person or group acquired 15% or more of the Company's common stock
CY2012	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.030875
CY2012Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2010	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	1150000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	800000	USD
CY2011	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	4101400000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	0	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	0	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	100000000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	300000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	14300000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2012	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	46400000	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	104600000	USD
CY2010	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	12400000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	52800000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	17200000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	19100000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	147900000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	40100000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	802200000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	946300000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	-575100000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	41600000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	178300000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	207800000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	-1002800000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	178700000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	194000000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	281400000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	292200000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11251600000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11801700000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	7263300000	USD
CY2011Q4	us-gaap	Related Party Transaction Due From To Related Party Current RelatedPartyTransactionDueFromToRelatedPartyCurrent	0	USD
CY2012Q4	us-gaap	Related Party Transaction Due From To Related Party Current RelatedPartyTransactionDueFromToRelatedPartyCurrent	0	USD
CY2010	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	1167300000	USD
CY2011	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	263900000	USD
CY2012	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	415800000	USD
CY2010	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	0	USD
CY2011	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	0	USD
CY2012	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	929000000	USD
CY2012Q4	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	921300000	USD
CY2012Q3	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	7700000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3066400000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3744000000	USD
CY2010	us-gaap	Revenues Revenues	6668200000	USD
CY2011	us-gaap	Revenues Revenues	7895900000	USD
CY2012	us-gaap	Revenues Revenues	8077500000	USD
CY2012Q2	us-gaap	Revenues Revenues	1981100000	USD
CY2012Q1	us-gaap	Revenues Revenues	2020700000	USD
CY2012Q4	us-gaap	Revenues Revenues	2016900000	USD
CY2012Q3	us-gaap	Revenues Revenues	2058800000	USD
CY2011Q3	us-gaap	Revenues Revenues	1980600000	USD
CY2011Q2	us-gaap	Revenues Revenues	1961700000	USD
CY2011Q4	us-gaap	Revenues Revenues	2229800000	USD
CY2011Q1	us-gaap	Revenues Revenues	1723800000	USD
CY2010	us-gaap	Royalty Expense RoyaltyExpense	540600000	USD
CY2012	us-gaap	Royalty Expense RoyaltyExpense	637500000	USD
CY2011	us-gaap	Royalty Expense RoyaltyExpense	610600000	USD
CY2011	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	268200000	USD
CY2010	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	232200000	USD
CY2012	us-gaap	Severance Costs SeveranceCosts	6700000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	43900000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	45400000	USD
CY2012	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	268800000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	600000	shares
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	41100000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	232165	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue	45.29
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1334532	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	34.05
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	2039331	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1531092	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	42.34
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	45.16
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	594128	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	28.73
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.006
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.006
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.006
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.0	years
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.0	years
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.0	years
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.640
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.641
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.642
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.009
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.020
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.028
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	6000000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	11800000	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4200000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	10300000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	53700000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	1500000	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	700000	shares
CY2010	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	200000	shares
CY2011	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	200000	shares
CY2012	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	300000	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1500000	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	300000	shares
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	200000	shares
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	6300000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5800000	USD
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	7000000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	16400000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2400000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4800000	USD
CY2010	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2012	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	-4200000	shares
CY2011	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	4904900000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	5485100000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5515800000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4938800000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3755900000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4689300000	USD
CY2013	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	65000000	USD
CY2011	us-gaap	Translation Adjustment Functional To Reporting Currency Loss Gain On Reclassified Of Earnings Net Of Tax TranslationAdjustmentFunctionalToReportingCurrencyLossGainOnReclassifiedOfEarningsNetOfTax	0	USD
CY2010	us-gaap	Translation Adjustment Functional To Reporting Currency Loss Gain On Reclassified Of Earnings Net Of Tax TranslationAdjustmentFunctionalToReportingCurrencyLossGainOnReclassifiedOfEarningsNetOfTax	0	USD
CY2012	us-gaap	Translation Adjustment Functional To Reporting Currency Loss Gain On Reclassified Of Earnings Net Of Tax TranslationAdjustmentFunctionalToReportingCurrencyLossGainOnReclassifiedOfEarningsNetOfTax	0	USD
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	9200000	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	13700000	shares
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	461600000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	353300000	USD
CY2008	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	199800000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	299600000	USD
CY2006	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	99800000	USD
CY2012Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	78600000	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	113200000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	111000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	119600000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	122800000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	19400000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	46100000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5200000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	17400000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3400000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	31900000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3400000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	13800000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	47200000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	26000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	21200000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	11400000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2012	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2011Q4	us-gaap	Unusual Or Infrequent Item Gross UnusualOrInfrequentItemGross	111800000	USD
CY2011Q3	us-gaap	Unusual Or Infrequent Item Gross UnusualOrInfrequentItemGross	122900000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates in the Preparation of the Consolidated Financial Statements</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"></font></div></div>
CY2012Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	714900000	USD
CY2011Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	79800000	USD
CY2012	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	521500000	USD
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1200000	shares
CY2010	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2900000	shares
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270300000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	269900000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	268000000	shares
CY2012Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	266300000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270900000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	266800000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	269800000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	272800000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270200000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270500000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270600000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	267000000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	268000000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269100000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	270100000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269200000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	266200000	shares
CY2012Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	266300000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269300000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269200000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	268900000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269000000	shares
CY2012Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	18400000	USD
CY2011Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	17300000	USD
CY2012	btu	Acceleration Of Asset Retirement Obligations AccelerationOfAssetRetirementObligations	7100000	USD
CY2011Q4	btu	Accrued Health Care AccruedHealthCare	9300000	USD
CY2012Q4	btu	Accrued Health Care AccruedHealthCare	21300000	USD
CY2011Q4	btu	Accrued Payroll And Related Benefits AccruedPayrollAndRelatedBenefits	254700000	USD
CY2012Q4	btu	Accrued Payroll And Related Benefits AccruedPayrollAndRelatedBenefits	256800000	USD
CY2011Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-464900000	USD
CY2012Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-411700000	USD
CY2010Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-353000000	USD
CY2009Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-343500000	USD
CY2011Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	-9600000	USD
CY2009Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	-10400000	USD
CY2010Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	-12800000	USD
CY2012Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	12700000	USD
CY2011	btu	Accumulated Other Comprehensive Loss Net Change In Fair Value Of Cash Flow Hedges AccumulatedOtherComprehensiveLossNetChangeInFairValueOfCashFlowHedges	286100000	USD
CY2012	btu	Accumulated Other Comprehensive Loss Net Change In Fair Value Of Cash Flow Hedges AccumulatedOtherComprehensiveLossNetChangeInFairValueOfCashFlowHedges	334900000	USD
CY2010	btu	Accumulated Other Comprehensive Loss Net Change In Fair Value Of Cash Flow Hedges AccumulatedOtherComprehensiveLossNetChangeInFairValueOfCashFlowHedges	229900000	USD
CY2012	btu	Additional Cash Upon Collection Of Underlying Receivables AdditionalCashUponCollectionOfUnderlyingReceivables	1247700000	USD
CY2010	btu	Additional Discretionary Contributions To Defined Contribution Pension Plans AdditionalDiscretionaryContributionsToDefinedContributionPensionPlans	19800000	USD
CY2011	btu	Additional Discretionary Contributions To Defined Contribution Pension Plans AdditionalDiscretionaryContributionsToDefinedContributionPensionPlans	20000000	USD
CY2012	btu	Additional Discretionary Contributions To Defined Contribution Pension Plans AdditionalDiscretionaryContributionsToDefinedContributionPensionPlans	22500000	USD
CY2012	btu	Aggregate Received From Alpha For Reimbursement Payment And First True Up Payment AggregateReceivedFromAlphaForReimbursementPaymentAndFirstTrueUpPayment	21300000	USD
CY2014Q4	btu	Aggregate Received From Alpha For Reimbursement Payment And First True Up Payment AggregateReceivedFromAlphaForReimbursementPaymentAndFirstTrueUpPayment	21300000	USD
CY2013Q4	btu	Aggregate Received From Alpha For Reimbursement Payment And First True Up Payment AggregateReceivedFromAlphaForReimbursementPaymentAndFirstTrueUpPayment	21300000	USD
CY2015Q4	btu	Aggregate Received From Alpha For Reimbursement Payment And First True Up Payment AggregateReceivedFromAlphaForReimbursementPaymentAndFirstTrueUpPayment	21300000	USD
CY2012Q4	btu	Alternative Minimum Tax Credits AlternativeMinimumTaxCredits	232600000	USD
CY2012Q4	btu	Amount Available For Repurchase Of Shares Under Share Repurchase Program AmountAvailableForRepurchaseOfSharesUnderShareRepurchaseProgram	700400000	USD
CY2012Q4	btu	Amount Available Under Securitization Program AmountAvailableUnderSecuritizationProgram	191500000	USD
CY2012Q4	btu	Amount In Letters Of Credit And Surety Bonds Related To Collateral For Surety Companies Road Maintenance Performance Guarantees And Other Operations AmountInLettersOfCreditAndSuretyBondsRelatedToCollateralForSuretyCompaniesRoadMaintenancePerformanceGuaranteesAndOtherOperations	185700000	USD
CY2011	btu	Annual Coal Reserve Payments Pursuant To Belle Ayr North Lease AnnualCoalReservePaymentsPursuantToBelleAyrNorthLease	42100000	USD
CY2013	btu	Annual Coal Reserve Payments Pursuant To Belle Ayr North Lease AnnualCoalReservePaymentsPursuantToBelleAyrNorthLease	42100000	USD
CY2014	btu	Annual Coal Reserve Payments Pursuant To Belle Ayr North Lease AnnualCoalReservePaymentsPursuantToBelleAyrNorthLease	42100000	USD
CY2015	btu	Annual Coal Reserve Payments Pursuant To Belle Ayr North Lease AnnualCoalReservePaymentsPursuantToBelleAyrNorthLease	42100000	USD
CY2012	btu	Annual Coal Reserve Payments Pursuant To Belle Ayr North Lease AnnualCoalReservePaymentsPursuantToBelleAyrNorthLease	42100000	USD
CY2011	btu	Annual Coal Reserve Payments Pursuant To Caballo West Lease AnnualCoalReservePaymentsPursuantToCaballoWestLease	28600000	USD
CY2013	btu	Annual Coal Reserve Payments Pursuant To Caballo West Lease AnnualCoalReservePaymentsPursuantToCaballoWestLease	28600000	USD
CY2015	btu	Annual Coal Reserve Payments Pursuant To Caballo West Lease AnnualCoalReservePaymentsPursuantToCaballoWestLease	28600000	USD
CY2012	btu	Annual Coal Reserve Payments Pursuant To Caballo West Lease AnnualCoalReservePaymentsPursuantToCaballoWestLease	28600000	USD
CY2014	btu	Annual Coal Reserve Payments Pursuant To Caballo West Lease AnnualCoalReservePaymentsPursuantToCaballoWestLease	28600000	USD
CY2012Q3	btu	Annual True Up Payments For Excess Of110 Bid Price Versus095 Under Transferred Lease AnnualTrueUpPaymentsForExcessOf110BidPriceVersus095UnderTransferredLease	3900000	USD
CY2012Q4	btu	Annual True Up Payments For Excess Of110 Bid Price Versus095 Under Transferred Lease AnnualTrueUpPaymentsForExcessOf110BidPriceVersus095UnderTransferredLease	3900000	USD
CY2015Q4	btu	Annual True Up Payments For Excess Of110 Bid Price Versus095 Under Transferred Lease AnnualTrueUpPaymentsForExcessOf110BidPriceVersus095UnderTransferredLease	3900000	USD
CY2013Q4	btu	Annual True Up Payments For Excess Of110 Bid Price Versus095 Under Transferred Lease AnnualTrueUpPaymentsForExcessOf110BidPriceVersus095UnderTransferredLease	3900000	USD
CY2014Q4	btu	Annual True Up Payments For Excess Of110 Bid Price Versus095 Under Transferred Lease AnnualTrueUpPaymentsForExcessOf110BidPriceVersus095UnderTransferredLease	3900000	USD
CY2012	btu	Annualpaymentsoncoalreserves2012 To2016 Annualpaymentsoncoalreserves2012To2016	247900000	USD
CY2013	btu	Annualpaymentsoncoalreserves2012 To2016 Annualpaymentsoncoalreserves2012To2016	247900000	USD
CY2014	btu	Annualpaymentsoncoalreserves2012 To2016 Annualpaymentsoncoalreserves2012To2016	247900000	USD
CY2016	btu	Annualpaymentsoncoalreserves2012 To2016 Annualpaymentsoncoalreserves2012To2016	247900000	USD
CY2015	btu	Annualpaymentsoncoalreserves2012 To2016 Annualpaymentsoncoalreserves2012To2016	247900000	USD
CY2011Q4	btu	Asset Retirement Obligation Active Locations AssetRetirementObligationActiveLocations	567900000	USD
CY2012Q4	btu	Asset Retirement Obligation Active Locations AssetRetirementObligationActiveLocations	629100000	USD
CY2011Q4	btu	Asset Retirement Obligation Closed Or Inactive Locations AssetRetirementObligationClosedOrInactiveLocations	47300000	USD
CY2012Q4	btu	Asset Retirement Obligation Closed Or Inactive Locations AssetRetirementObligationClosedOrInactiveLocations	58400000	USD
CY2011Q4	btu	Assets From Coal Trading Activities Net AssetsFromCoalTradingActivitiesNet	44600000	USD
CY2012Q4	btu	Assets From Coal Trading Activities Net AssetsFromCoalTradingActivitiesNet	52400000	USD
CY2012Q4	btu	Ato Assessment Litigation Deposit Percentage AtoAssessmentLitigationDepositPercentage	0.5
CY2012Q4	btu	Ato Proposed Assessment AtoProposedAssessment	82200000	USD
CY2012Q4	btu	Ato Proposed Assessment Penalties And Interest AtoProposedAssessmentPenaltiesAndInterest	25600000	USD
CY2012Q4	btu	Ato Proposed Assessment Tax AtoProposedAssessmentTax	56600000	USD
CY2011Q3	btu	Bid Price Per Mineable Ton BidPricePerMineableTon	0.95	USD
CY2011Q3	btu	Bid Price Per Mineable Ton In Powder River Basin BidPricePerMineableTonInPowderRiverBasin	1.10	USD
CY2011Q4	btu	Business Acquisition Percentage Of Agreed Sale Price As Consideration BusinessAcquisitionPercentageOfAgreedSalePriceAsConsideration	0.20
CY2012Q4	btu	Business Acquisition Percentage Of Agreed Sale Price As Final Installment Payment BusinessAcquisitionPercentageOfAgreedSalePriceAsFinalInstallmentPayment	0.40
CY2012Q3	btu	Business Acquistion Percentage Of Agreed Sales Price First Installment Payment BusinessAcquistionPercentageOfAgreedSalesPriceFirstInstallmentPayment	0.40
CY2012	btu	Business Combinations Provisional Information Initial Accounting Adjustment Loss From Equity Affiliates BusinessCombinationsProvisionalInformationInitialAccountingAdjustmentLossFromEquityAffiliates	5600000	USD
CY2012	btu	Business Combinations Provisional Information Initial Accounting Incomplete Adjustment Depreciation Depletion And Amortization BusinessCombinationsProvisionalInformationInitialAccountingIncompleteAdjustmentDepreciationDepletionAndAmortization	-9200000	USD
CY2012	btu	Business Combinations Provisional Information Initial Accounting Incomplete Adjustment Operating Costs And Expenses BusinessCombinationsProvisionalInformationInitialAccountingIncompleteAdjustmentOperatingCostsAndExpenses	-10100000	USD
CY2011	btu	Cash Proceeds From Sale Of Nonstrategic Coal Reserves CashProceedsFromSaleOfNonstrategicCoalReserves	24900000	USD
CY2012	btu	Cash Up Front From Sale Of Receivables CashUpFrontFromSaleOfReceivables	2834500000	USD
CY2012	btu	Change In Unreconized Tax Benefit ChangeInUnreconizedTaxBenefit	3200000	USD
CY2010	btu	Changes In Tax Reserves ChangesInTaxReserves	0	USD
CY2012	btu	Changes In Tax Reserves ChangesInTaxReserves	24500000	USD
CY2011	btu	Changes In Tax Reserves ChangesInTaxReserves	14700000	USD
CY2012Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDue	1126100000	USD
CY2012Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Five Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInFiveYears	4600000	USD
CY2012Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Four Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInFourYears	252600000	USD
CY2012Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Three Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInThreeYears	278000000	USD
CY2012Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Two Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInTwoYears	280400000	USD
CY2012Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due Thereafter CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueThereafter	28300000	USD
CY2012Q4	btu	Coal Lease And Royalty Obligation Future Minimum Payments Due Current CoalLeaseAndRoyaltyObligationFutureMinimumPaymentsDueCurrent	282200000	USD
CY2011Q4	btu	Coal Reserves CoalReserves	7600000000	USD
CY2012Q4	btu	Coal Reserves CoalReserves	6400000000	USD
CY2012Q4	btu	Coal Reserves Not Subject To Depletion CoalReservesNotSubjectToDepletion	2200000000	USD
CY2011Q4	btu	Coal Reserves Not Subject To Depletion CoalReservesNotSubjectToDepletion	2700000000	USD
CY2012Q4	btu	Common Stock Discount Under Employee Stock Purchase Plans CommonStockDiscountUnderEmployeeStockPurchasePlans	0.15
CY2012Q4	btu	Company Lease Obligations CompanyLeaseObligations	105300000	USD
CY2012	btu	Consideration Received By Company Related To Securitization Program ConsiderationReceivedByCompanyRelatedToSecuritizationProgram	4377800000	USD
CY2011Q4	btu	Consideration Received By Company Upon Completion Of Sell Down ConsiderationReceivedByCompanyUponCompletionOfSellDown	15000000	AUD
CY2012	btu	Contributions To Joint Ventures ContributionsToJointVentures	824000000	USD
CY2011	btu	Contributions To Joint Ventures ContributionsToJointVentures	145400000	USD
CY2010	btu	Contributions To Joint Ventures ContributionsToJointVentures	0	USD
CY2011Q4	btu	Credit Adjusted Risk Free Interest Rates CreditAdjustedRiskFreeInterestRates	0.0576
CY2010Q4	btu	Credit Adjusted Risk Free Interest Rates CreditAdjustedRiskFreeInterestRates	0.0637
CY2012Q4	btu	Credit Adjusted Risk Free Interest Rates CreditAdjustedRiskFreeInterestRates	0.0628
CY2012Q4	btu	Decrease In Seaborne Coal Prices DecreaseInSeaborneCoalPrices	0.3
CY2012Q4	btu	Deferred Tax Assets Financial Guarantee DeferredTaxAssetsFinancialGuarantee	18600000	USD
CY2011Q4	btu	Deferred Tax Assets Financial Guarantee DeferredTaxAssetsFinancialGuarantee	18500000	USD
CY2012Q4	btu	Deferred Tax Assets Tax Credit And Operating Loss Carryforwards DeferredTaxAssetsTaxCreditAndOperatingLossCarryforwards	1390100000	USD
CY2011Q4	btu	Deferred Tax Assets Tax Credit And Operating Loss Carryforwards DeferredTaxAssetsTaxCreditAndOperatingLossCarryforwards	432800000	USD
CY2012Q4	btu	Deferred Tax Liabilities Investments And Other Assets DeferredTaxLiabilitiesInvestmentsAndOtherAssets	126300000	USD
CY2011Q4	btu	Deferred Tax Liabilities Investments And Other Assets DeferredTaxLiabilitiesInvestmentsAndOtherAssets	109800000	USD
CY2012	btu	Defined Benefit Plan Amortization Period DefinedBenefitPlanAmortizationPeriod	11.75	years
	btu	Definedintervalinyearstopaydividendsonperpetualpreferredstock Definedintervalinyearstopaydividendsonperpetualpreferredstock	five
CY2012	btu	Distributions From Joint Ventures DistributionsFromJointVentures	823000000	USD
CY2010	btu	Distributions From Joint Ventures DistributionsFromJointVentures	0	USD
CY2011	btu	Distributions From Joint Ventures DistributionsFromJointVentures	128600000	USD
CY2012Q4	btu	Dta Lease Term DtaLeaseTerm	30
CY2010	btu	Earnings From Continuing Operations Allocated To Participating Securities EarningsFromContinuingOperationsAllocatedToParticipatingSecurities	-5600000	USD
CY2011	btu	Earnings From Continuing Operations Allocated To Participating Securities EarningsFromContinuingOperationsAllocatedToParticipatingSecurities	-5300000	USD
CY2011Q4	btu	Deferred Tax Assets Intangible Tax Asset And Purchased Contract Rights DeferredTaxAssetsIntangibleTaxAssetAndPurchasedContractRights	13400000	USD
CY2012Q4	btu	Deferred Tax Assets Intangible Tax Asset And Purchased Contract Rights DeferredTaxAssetsIntangibleTaxAssetAndPurchasedContractRights	7900000	USD
CY2012	btu	Earnings From Continuing Operations Allocated To Participating Securities EarningsFromContinuingOperationsAllocatedToParticipatingSecurities	0	USD
CY2012	btu	Electedmemberstoserveoncompanysboardofdirectors Electedmemberstoserveoncompanysboardofdirectors	two
CY2012	btu	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition Weighted Average EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionWeightedAverage	0.8	years
CY2012	btu	Employee Stock Purchase Plans Fair Value Estimation EmployeeStockPurchasePlansFairValueEstimation	estimated by adding the fair value of 0.15 of one share of stock to the fair value of 0.85 of an option on one share of stock
CY2012Q4	btu	Entity Number Of Hourly Employees EntityNumberOfHourlyEmployees	5700
CY2010	btu	Expenses Associated With Securitization Transactions ExpensesAssociatedWithSecuritizationTransactions	2400000	USD
CY2011	btu	Expenses Associated With Securitization Transactions ExpensesAssociatedWithSecuritizationTransactions	2000000	USD
CY2012	btu	Expenses Associated With Securitization Transactions ExpensesAssociatedWithSecuritizationTransactions	2000000	USD
CY2012	btu	Federal And State Capital Loss Tax Benefit On Acquisition Restructuring FederalAndStateCapitalLossTaxBenefitOnAcquisitionRestructuring	39600000	USD
CY2010	btu	Federal Coal Lease Expenditure FederalCoalLeaseExpenditure	0	USD
CY2011	btu	Federal Coal Lease Expenditure FederalCoalLeaseExpenditure	42400000	USD
CY2012	btu	Federal Coal Lease Expenditure FederalCoalLeaseExpenditure	276500000	USD
	btu	Federal Coal Lease Term FederalCoalLeaseTerm	20	Y
CY2010	btu	Foreign Currency Remeasurement Gains Losses ForeignCurrencyRemeasurementGainsLosses	38500000	USD
CY2011	btu	Foreign Currency Remeasurement Gains Losses ForeignCurrencyRemeasurementGainsLosses	900000	USD
CY2012	btu	Foreign Currency Remeasurement Gains Losses ForeignCurrencyRemeasurementGainsLosses	-4800000	USD
CY2012	btu	Foreign Tax Benefit Due To Acquisition Restructuring ForeignTaxBenefitDueToAcquisitionRestructuring	35100000	USD
CY2012Q4	btu	General Business Credits GeneralBusinessCredits	52600000	USD
CY2012	btu	Goals To Be Achieved Under Performance Units Awards Based On Return On Capital Target GoalsToBeAchievedUnderPerformanceUnitsAwardsBasedOnReturnOnCapitalTarget	0.50
CY2012	btu	Goals To Be Achieved Under Performance Units Awards Based On Stock Price Performance GoalsToBeAchievedUnderPerformanceUnitsAwardsBasedOnStockPricePerformance	0.50
CY2011Q4	btu	Gross Unrecognized Tax Benefits Included In Other Noncurrent Liabilities GrossUnrecognizedTaxBenefitsIncludedInOtherNoncurrentLiabilities	119600000	USD
CY2012Q4	btu	Gross Unrecognized Tax Benefits Included In Other Noncurrent Liabilities GrossUnrecognizedTaxBenefitsIncludedInOtherNoncurrentLiabilities	122800000	USD
CY2010	btu	Income From Continuing Operations Attributable To Common Stockholders IncomeFromContinuingOperationsAttributableToCommonStockholders	791200000	USD
CY2011	btu	Income From Continuing Operations Attributable To Common Stockholders IncomeFromContinuingOperationsAttributableToCommonStockholders	1018900000	USD
CY2012	btu	Income From Continuing Operations Attributable To Common Stockholders IncomeFromContinuingOperationsAttributableToCommonStockholders	-481500000	USD
CY2012Q4	btu	Land And Coal Interests LandAndCoalInterests	10947700000	USD
CY2011Q4	btu	Land And Coal Interests LandAndCoalInterests	10630500000	USD
CY2012	btu	Lease Term LeaseTerm	ten years
CY2012Q2	btu	Leasedcoalreservesadjacenttonarm Leasedcoalreservesadjacenttonarm	1100000000	T
CY2012Q4	btu	Mrrt Market Value Allowance Deferred Tax Asset MrrtMarketValueAllowanceDeferredTaxAsset	871800000	USD
CY2011	btu	Net Assets From Coal Trading Activities NetAssetsFromCoalTradingActivities	172400000	USD
CY2012	btu	Net Assets From Coal Trading Activities NetAssetsFromCoalTradingActivities	125200000	USD
CY2011Q4	btu	Liabilities From Coal Trading Activities Net LiabilitiesFromCoalTradingActivitiesNet	10300000	USD
CY2012Q4	btu	Liabilities From Coal Trading Activities Net LiabilitiesFromCoalTradingActivitiesNet	19400000	USD
CY2011Q3	btu	Litigation Settlement Damages Awarded To Plaintiff LitigationSettlementDamagesAwardedToPlaintiff	20500000	USD
CY2011	btu	Loss From Discontinued Operations Allocated To Participating Securities LossFromDiscontinuedOperationsAllocatedToParticipatingSecurities	-400000	USD
CY2010	btu	Loss From Discontinued Operations Allocated To Participating Securities LossFromDiscontinuedOperationsAllocatedToParticipatingSecurities	-200000	USD
CY2012	btu	Loss From Discontinued Operations Allocated To Participating Securities LossFromDiscontinuedOperationsAllocatedToParticipatingSecurities	0	USD
CY2010	btu	Loss From Discontinued Operations Attributable To Common Stockholders After Earnings Allocated To Participating Securities LossFromDiscontinuedOperationsAttributableToCommonStockholdersAfterEarningsAllocatedToParticipatingSecurities	-22600000	USD
CY2012	btu	Loss From Discontinued Operations Attributable To Common Stockholders After Earnings Allocated To Participating Securities LossFromDiscontinuedOperationsAttributableToCommonStockholdersAfterEarningsAllocatedToParticipatingSecurities	-104200000	USD
CY2011	btu	Loss From Discontinued Operations Attributable To Common Stockholders After Earnings Allocated To Participating Securities LossFromDiscontinuedOperationsAttributableToCommonStockholdersAfterEarningsAllocatedToParticipatingSecurities	-66100000	USD
CY2010	btu	Loss From Equity Affiliates Amortization Of Basis Difference LossFromEquityAffiliatesAmortizationOfBasisDifference	0	USD
CY2012	btu	Loss From Equity Affiliates Amortization Of Basis Difference LossFromEquityAffiliatesAmortizationOfBasisDifference	4600000	USD
CY2011	btu	Loss From Equity Affiliates Amortization Of Basis Difference LossFromEquityAffiliatesAmortizationOfBasisDifference	0	USD
CY2012Q4	btu	Maximum Capacity Of Securitization Program MaximumCapacityOfSecuritizationProgram	275000000	USD
CY2012	btu	Maximum Common Shares Authorized For Repurchase MaximumCommonSharesAuthorizedForRepurchase	1000000000	USD
CY2012	btu	Maximum Common Shares Authorized For Repurchase Outside Share Repurchase Program MaximumCommonSharesAuthorizedForRepurchaseOutsideShareRepurchaseProgram	100000000	USD
CY2012	btu	Maximum Employee Contribution To Employee Stock Purchase Plans Based On Compensation Amount MaximumEmployeeContributionToEmployeeStockPurchasePlansBasedOnCompensationAmount	25000	USD
CY2012Q4	btu	Maximum Employee Contribution To Employee Stock Purchase Plans Based On Compensation Pecentage MaximumEmployeeContributionToEmployeeStockPurchasePlansBasedOnCompensationPecentage	0.15
CY2012Q4	btu	Minerals Resource Rent Tax MineralsResourceRentTax	689700000	USD
CY2011Q4	btu	Minerals Resource Rent Tax MineralsResourceRentTax	0	USD
CY2012	btu	Minerals Resource Rent Tax Deferred Liability MineralsResourceRentTaxDeferredLiability	77200000	USD
CY2011	btu	Minerals Resource Rent Tax Deferred Liability MineralsResourceRentTaxDeferredLiability	0	USD
CY2010	btu	Minerals Resource Rent Tax Deferred Liability MineralsResourceRentTaxDeferredLiability	0	USD
CY2012Q4	btu	Minerals Resource Rent Tax Deferred Liability MineralsResourceRentTaxDeferredLiability	77200000	USD
CY2012Q4	btu	Minerals Resource Rent Tax Percentage MineralsResourceRentTaxPercentage	0.225
CY2012	btu	Minimum Annual Production Of Coal Mining Leases On Original Amount MinimumAnnualProductionOfCoalMiningLeasesOnOriginalAmount	0.010
CY2012	btu	Mining Lease Terms MiningLeaseTerms	up to 21 years
CY2011	btu	Minority Interest Increase From Contributions To Noncontrolling Interest Holders MinorityInterestIncreaseFromContributionsToNoncontrollingInterestHolders	1200000	USD
CY2012	btu	Monetization Of Foreign Currency Hedge Positions MonetizationOfForeignCurrencyHedgePositions	151800000	USD
CY2011	btu	Monetization Of Foreign Currency Hedge Positions MonetizationOfForeignCurrencyHedgePositions	0	USD
CY2010	btu	Monetization Of Foreign Currency Hedge Positions MonetizationOfForeignCurrencyHedgePositions	0	USD
CY2012	btu	Monthly Royalties Payable From Sale Using Surface Mining Methods MonthlyRoyaltiesPayableFromSaleUsingSurfaceMiningMethods	0.125
CY2012	btu	Monthly Royalties Payable Of Production Using Underground Mining Methods MonthlyRoyaltiesPayableOfProductionUsingUndergroundMiningMethods	0.080
CY2012Q4	btu	Mrrt Excess Book Over Tax Basis On Exploration Properties MrrtExcessBookOverTaxBasisOnExplorationProperties	182100000	USD
CY2010	btu	Net Assets From Coal Trading Activities NetAssetsFromCoalTradingActivities	-109600000	USD
CY2012Q4	btu	Net Tax Benefit From Asst Impairment And Mine Closure Costs NetTaxBenefitFromAsstImpairmentAndMineClosureCosts	227300000	USD
CY2012Q3	btu	Net Tax Benefit From Asst Impairment And Mine Closure Costs NetTaxBenefitFromAsstImpairmentAndMineClosureCosts	2900000	USD
CY2012	btu	Net Tax Benefits Related To Acquisition Restructuring NetTaxBenefitsRelatedToAcquisitionRestructuring	74700000	USD
CY2012Q4	btu	Net Tax Benefits Related To Acquisition Restructuring NetTaxBenefitsRelatedToAcquisitionRestructuring	15000000	USD
CY2012Q2	btu	Net Tax Benefits Related To Acquisition Restructuring NetTaxBenefitsRelatedToAcquisitionRestructuring	59700000	USD
CY2011Q4	btu	Net Unrecognized Tax Benefits Included In Other Noncurrent Liabilities NetUnrecognizedTaxBenefitsIncludedInOtherNoncurrentLiabilities	114700000	USD
CY2012Q4	btu	Net Unrecognized Tax Benefits Included In Other Noncurrent Liabilities NetUnrecognizedTaxBenefitsIncludedInOtherNoncurrentLiabilities	119700000	USD
CY2011Q3	btu	Non Cash Benefit From Remeasurement Of Foreign Income Tax Accounts NonCashBenefitFromRemeasurementOfForeignIncomeTaxAccounts	38700000	USD
CY2012Q4	btu	Non Cash Benefit From Remeasurement Of Foreign Income Tax Accounts NonCashBenefitFromRemeasurementOfForeignIncomeTaxAccounts	800000	USD
CY2012Q2	btu	Non Cash Benefit From Remeasurement Of Foreign Income Tax Accounts NonCashBenefitFromRemeasurementOfForeignIncomeTaxAccounts	13800000	USD
CY2011Q4	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	16000000	USD
CY2011Q2	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	15400000	USD
CY2012Q3	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	13600000	USD
CY2012Q1	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	8900000	USD
CY2011Q1	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	6400000	USD
CY2012Q4	btu	Non Collected Receivables NonCollectedReceivables	295600000	USD
CY2012	btu	Noncash Interest Expense NoncashInterestExpense	20700000	USD
CY2010	btu	Noncash Interest Expense NoncashInterestExpense	12800000	USD
CY2011	btu	Noncash Interest Expense NoncashInterestExpense	15500000	USD
CY2012	btu	Noncontrolling Interest Increase From Business Combination As Of Control Date NoncontrollingInterestIncreaseFromBusinessCombinationAsOfControlDate	39000000	USD
CY2011	btu	Noncontrolling Interest Increase From Business Combination As Of Control Date NoncontrollingInterestIncreaseFromBusinessCombinationAsOfControlDate	2011900000	USD
CY2011	btu	Notes Receivables From Sale Of Nonstrategic Coal Reserves NotesReceivablesFromSaleOfNonstrategicCoalReserves	17400000	USD
CY2012Q3	btu	Number Of Annual True Up Payments NumberOfAnnualTrueUpPayments	5
CY2007Q4	btu	Number Of Coal Preparation Facilities Servicing Contractor Operatedines Included In Patriot Spin Off NumberOfCoalPreparationFacilitiesServicingContractorOperatedinesIncludedInPatriotSpinOff	8
CY2007Q4	btu	Number Of Company Operated Mines Included In Patriot Spin Off NumberOfCompanyOperatedMinesIncludedInPatriotSpinOff	8
CY2012	btu	Number Of Defined Contribution Plans NumberOfDefinedContributionPlans	3	plans
CY2007Q4	btu	Number Of Majority Owned Jv Mines Included In Patriot Spin Off NumberOfMajorityOwnedJvMinesIncludedInPatriotSpinOff	2
CY2012	btu	Number Of Shares Repurchased NumberOfSharesRepurchased	7700000	shares
CY2011Q3	btu	Number Of Tons Of Coal In Which Company Was Named Winning Bidder Adjacent To Caballo NumberOfTonsOfCoalInWhichCompanyWasNamedWinningBidderAdjacentToCaballo	220000000	T
CY2011Q3	btu	Number Of Tons Of Coal In Which Company Was Named Winning Bidder In Powder River Basin NumberOfTonsOfCoalInWhichCompanyWasNamedWinningBidderInPowderRiverBasin	130000000	T
CY2012Q4	btu	Number Of Us Mines Represented By Unions NumberOfUsMinesRepresentedByUnions	2
CY2010	btu	Operating Costs And Expense OperatingCostsAndExpense	4637700000	USD
CY2011	btu	Other Comprehensive Income From Investment In Subsidiaries OtherComprehensiveIncomeFromInvestmentInSubsidiaries	0	USD
CY2012	btu	Numberoffailedamountofdividendsonpreferredstock Numberoffailedamountofdividendsonpreferredstock	six
CY2012	btu	Operating Costs And Expense OperatingCostsAndExpense	5932700000	USD
CY2012	btu	Other Comprehensive Income From Investment In Subsidiaries OtherComprehensiveIncomeFromInvestmentInSubsidiaries	0	USD
CY2010	btu	Other Comprehensive Income From Investment In Subsidiaries OtherComprehensiveIncomeFromInvestmentInSubsidiaries	0	USD
CY2010	btu	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2011	btu	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-5800000	USD
CY2012	btu	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-15500000	USD
CY2012	btu	Other Comprehensive Income Loss Current Period Change Net Of Tax OtherComprehensiveIncomeLossCurrentPeriodChangeNetOfTax	39200000	USD
CY2011	btu	Other Comprehensive Income Loss Current Period Change Net Of Tax OtherComprehensiveIncomeLossCurrentPeriodChangeNetOfTax	-149200000	USD
CY2010	btu	Other Comprehensive Income Loss Current Period Change Net Of Tax OtherComprehensiveIncomeLossCurrentPeriodChangeNetOfTax	-46200000	USD
CY2012	btu	Other Comprehensive Income Loss Reclassification And Amortization Pension And Other Postretirement Benefit Plans Net Gain Loss And Net Prior Service Cost Recognized Net Of Tax OtherComprehensiveIncomeLossReclassificationAndAmortizationPensionAndOtherPostretirementBenefitPlansNetGainLossAndNetPriorServiceCostRecognizedNetOfTax	55400000	USD
CY2011	btu	Other Comprehensive Income Loss Reclassification And Amortization Pension And Other Postretirement Benefit Plans Net Gain Loss And Net Prior Service Cost Recognized Net Of Tax OtherComprehensiveIncomeLossReclassificationAndAmortizationPensionAndOtherPostretirementBenefitPlansNetGainLossAndNetPriorServiceCostRecognizedNetOfTax	40500000	USD
CY2010	btu	Other Comprehensive Income Loss Reclassification And Amortization Pension And Other Postretirement Benefit Plans Net Gain Loss And Net Prior Service Cost Recognized Net Of Tax OtherComprehensiveIncomeLossReclassificationAndAmortizationPensionAndOtherPostretirementBenefitPlansNetGainLossAndNetPriorServiceCostRecognizedNetOfTax	34300000	USD
CY2011	btu	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	-211400000	USD
CY2010	btu	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	-68100000	USD
CY2012	btu	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	-220700000	USD
CY2011Q4	btu	Other Noncurrent Liability OtherNoncurrentLiability	2313900000	USD
CY2012Q4	btu	Other Noncurrent Liability OtherNoncurrentLiability	2413700000	USD
CY2011	btu	Othercomprehensiveincomelosspensionandotherpostretirementbenefitplanspriorservicecostcredit Othercomprehensiveincomelosspensionandotherpostretirementbenefitplanspriorservicecostcredit	900000	USD
CY2010	btu	Othercomprehensiveincomelosspensionandotherpostretirementbenefitplanspriorservicecostcredit Othercomprehensiveincomelosspensionandotherpostretirementbenefitplanspriorservicecostcredit	-4900000	USD
CY2012	btu	Othercomprehensiveincomelosspensionandotherpostretirementbenefitplanspriorservicecostcredit Othercomprehensiveincomelosspensionandotherpostretirementbenefitplanspriorservicecostcredit	20100000	USD
CY2011	btu	Paid Discretionary Contributions To Defined Contribution Pension Plans Company Match PaidDiscretionaryContributionsToDefinedContributionPensionPlansCompanyMatch	54500000	USD
CY2012	btu	Paid Discretionary Contributions To Defined Contribution Pension Plans Company Match PaidDiscretionaryContributionsToDefinedContributionPensionPlansCompanyMatch	51100000	USD
CY2010	btu	Paid Discretionary Contributions To Defined Contribution Pension Plans Company Match PaidDiscretionaryContributionsToDefinedContributionPensionPlansCompanyMatch	51300000	USD
CY2011Q4	btu	Patriot Collateral Posted With Department Of Labor PatriotCollateralPostedWithDepartmentOfLabor	15000000	USD
CY2010	btu	Payments For Repurchase Of Common Stock Relinquished For Tax Withholding PaymentsForRepurchaseOfCommonStockRelinquishedForTaxWithholding	13500000	USD
CY2012	btu	Payments For Repurchase Of Common Stock Relinquished For Tax Withholding PaymentsForRepurchaseOfCommonStockRelinquishedForTaxWithholding	8400000	USD
CY2011	btu	Payments For Repurchase Of Common Stock Relinquished For Tax Withholding PaymentsForRepurchaseOfCommonStockRelinquishedForTaxWithholding	18700000	USD
CY2012Q4	btu	Percentage Of Coal Production Generated By Hourly Employees Represented By Organized Labor Unions PercentageOfCoalProductionGeneratedByHourlyEmployeesRepresentedByOrganizedLaborUnions	0.19
CY2012Q4	btu	Percentage Of Companys Qualified Pension Plans On Gaap Accounting Basis PercentageOfCompanysQualifiedPensionPlansOnGaapAccountingBasis	0.80
CY2012Q4	btu	Percentage Of Employees Represented By Organized Labor Unions PercentageOfEmployeesRepresentedByOrganizedLaborUnions	0.30
CY2012	btu	Period Considered To Treat Short Term Highly Liquid Investments As Cash Equivalents PeriodConsideredToTreatShortTermHighlyLiquidInvestmentsAsCashEquivalents	three months or less
CY2012	btu	Period For Payment Of Dividend On Perpetual Preferred Stock PeriodForPaymentOfDividendOnPerpetualPreferredStock	10
CY2012	btu	Period To Redetermine Royalty Rates On Leased Coal Reserves PeriodToRedetermineRoyaltyRatesOnLeasedCoalReserves	every ten years
CY2012Q3	btu	Potential Exposure From Patriot Bankruptcy PotentialExposureFromPatriotBankruptcy	150000000	USD
CY2007Q4	btu	Proven And Probable Coal Reserves Related To Patriot ProvenAndProbableCoalReservesRelatedToPatriot	1200000000	T
CY2011Q4	btu	Raw Coal RawCoal	108100000	USD
CY2012Q4	btu	Raw Coal RawCoal	164300000	USD
CY2011	btu	Reallocation Adjustment For Participatory Securities ReallocationAdjustmentForParticipatorySecurities	100000	USD
CY2010	btu	Reallocation Adjustment For Participatory Securities ReallocationAdjustmentForParticipatorySecurities	100000	USD
CY2012Q4	btu	Reclassification Of Self Bonding In Certain States In Which Company Qualifies ReclassificationOfSelfBondingInCertainStatesInWhichCompanyQualifies	1275800000	USD
CY2011Q4	btu	Reclassification Of Self Bonding In Certain States In Which Company Qualifies ReclassificationOfSelfBondingInCertainStatesInWhichCompanyQualifies	929600000	USD
CY2010	btu	Recognized Gain On Coal Reserves Exchange RecognizedGainOnCoalReservesExchange	23700000	USD
CY2011	btu	Recognized Gain On Coal Reserves Exchange RecognizedGainOnCoalReservesExchange	37700000	USD
CY2012	btu	Redemption Price Of Bonds As Percentage Of Principal Amount Plus Make Whole Premium And Any Accrued Unpaid Interest To Redemption Date RedemptionPriceOfBondsAsPercentageOfPrincipalAmountPlusMakeWholePremiumAndAnyAccruedUnpaidInterestToRedemptionDate	1.00
CY2012	btu	Redemption Price Of Debt As Percentage Of Principal Amount Of Debentures RedemptionPriceOfDebtAsPercentageOfPrincipalAmountOfDebentures	1.01
CY2012Q3	btu	Reimbursement For Difference In Federal Coal Lease Payments Made In2011 ReimbursementForDifferenceInFederalCoalLeasePaymentsMadeIn2011	13500000	USD
CY2012Q4	btu	Remaining Annual True Up Payments Due From Alpha On November1 Of Each Of Years From2012 Through2015 RemainingAnnualTrueUpPaymentsDueFromAlphaOnNovember1OfEachOfYearsFrom2012Through2015	3
CY2010	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	47900000	USD
CY2012	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	7900000	USD
CY2011	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	-900000	USD
CY2012	btu	Sale Of Business Percentage Of Ownership Before Transaction SaleOfBusinessPercentageOfOwnershipBeforeTransaction	0.85
CY2012Q4	btu	Saleable Coal SaleableCoal	226500000	USD
CY2011Q4	btu	Saleable Coal SaleableCoal	212600000	USD
CY2011	btu	Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization SegmentReportingInformationAdjustedEarningBeforeInterestTaxesDepreciationAndAmortization	2122600000	USD
CY2010	btu	Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization SegmentReportingInformationAdjustedEarningBeforeInterestTaxesDepreciationAndAmortization	1826500000	USD
CY2012	btu	Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization SegmentReportingInformationAdjustedEarningBeforeInterestTaxesDepreciationAndAmortization	1836500000	USD
CY2011	btu	Segment Reporting Revenue Percentage SegmentReportingRevenuePercentage	1.00
CY2012	btu	Segment Reporting Revenue Percentage SegmentReportingRevenuePercentage	1.00
CY2010	btu	Segment Reporting Revenue Percentage SegmentReportingRevenuePercentage	1.00
CY2010	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue	23300000	USD
CY2011	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue	36900000	USD
CY2012	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue	44400000	USD
CY2011	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodFairValue	50000000	USD
CY2012	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodFairValue	19900000	USD
CY2010	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodFairValue	20500000	USD
CY2010	btu	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageFairValue	25.70	USD
CY2011	btu	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageFairValue	33.92	USD
CY2012	btu	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageFairValue	18.59	USD
CY2012	btu	Share Based Compensation Expense Net Of Tax ShareBasedCompensationExpenseNetOfTax	28700000	USD
CY2011	btu	Share Based Compensation Expense Net Of Tax ShareBasedCompensationExpenseNetOfTax	27600000	USD
CY2010	btu	Share Based Compensation Expense Net Of Tax ShareBasedCompensationExpenseNetOfTax	25700000	USD
CY2012	btu	Shares Relinquished SharesRelinquished	8400000	USD
CY2010	btu	Shares Relinquished SharesRelinquished	13500000	USD
CY2011	btu	Shares Relinquished SharesRelinquished	18700000	USD
CY2011	btu	Shares Relinquished Shares SharesRelinquishedShares	-300000	shares
CY2010	btu	Shares Relinquished Shares SharesRelinquishedShares	-300000	shares
CY2012	btu	Shares Relinquished Shares SharesRelinquishedShares	-300000	shares
CY2011Q4	btu	Surety Bonds Outstanding For Reclamation SuretyBondsOutstandingForReclamation	791600000	USD
CY2012Q4	btu	Surety Bonds Outstanding For Reclamation SuretyBondsOutstandingForReclamation	571600000	USD
CY2012Q4	btu	Take Or Pay Obligations Due In One Year TakeOrPayObligationsDueInOneYear	424300000	USD
CY2012Q4	btu	Take Or Pay Obligations Total TakeOrPayObligationsTotal	4355400000	USD
	btu	Takeorpayarrangementterms Takeorpayarrangementterms	28
CY2012	btu	Tax Benefits Recognized From Uncertain Tax Positions Measurement TaxBenefitsRecognizedFromUncertainTaxPositionsMeasurement	greater than fifty percent likelihood of being realized upon ultimate settlement
CY2012Q4	btu	Taxes On Repatriate Of Foreign Earnings TaxesOnRepatriateOfForeignEarnings	120000000	USD
CY2012Q4	btu	Total Shares Of Common Stock Available For Grant TotalSharesOfCommonStockAvailableForGrant	14000000	shares
CY2010	btu	Transactions With Affiliates Net TransactionsWithAffiliatesNet	0	USD
CY2012	btu	Transactions With Affiliates Net TransactionsWithAffiliatesNet	0	USD
CY2011	btu	Transactions With Affiliates Net TransactionsWithAffiliatesNet	0	USD
CY2012Q4	btu	Unamortized Debt Issuance Expense Which Will Be Amortized To Interest Expense Over Next Five Years UnamortizedDebtIssuanceExpenseWhichWillBeAmortizedToInterestExpenseOverNextFiveYears	62700000	USD
CY2012Q4	btu	Us Capital Loss Carryforwards UsCapitalLossCarryforwards	113200000	USD
CY2012Q4	btu	Valuation Allowance Mineral Resource Rent Tax ValuationAllowanceMineralResourceRentTax	-766900000	USD
CY2011Q4	btu	Valuation Allowance Mineral Resource Rent Tax ValuationAllowanceMineralResourceRentTax	0	USD
CY2012Q4	btu	Valuation Allowance Minerals Resource Rent Tax ValuationAllowanceMineralsResourceRentTax	766900000	USD
CY2012Q2	btu	Weightedaveragebidpricepermineableton Weightedaveragebidpricepermineableton	1.10	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001064728
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	269630757	shares
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	8200
CY2012Q2	dei	Entity Public Float EntityPublicFloat	6600000000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	PEABODY ENERGY CORP
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes

Files In Submission

Name	View Source	Status
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0001064728-13-000014-index.html	Edgar Link	pending
0001064728-13-000014.txt	Edgar Link	pending
0001064728-13-000014-xbrl.zip	Edgar Link	pending
btu-20121231.xml	Edgar Link	completed
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btu-20121231_def.xml	Edgar Link	unprocessable
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btu-20121231_pre.xml	Edgar Link	unprocessable
btu_2012123110k.htm	Edgar Link	pending
btu_20121231ex1024.htm	Edgar Link	pending
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btu_20121231ex95.htm	Edgar Link	pending
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peabodya01a01.gif	Edgar Link	pending
peabodyausmap.jpg	Edgar Link	pending
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$BTU
PEABODY ENERGY CORP Stock $btu

2011 Q4 Form 10-K Financial Statement

#000106472813000014 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BTU PEABODY ENERGY CORP Stock $btu

2011 Q4 Form 10-K Financial Statement

#000106472813000014 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BTU
PEABODY ENERGY CORP Stock $btu