$BTU
PEABODY ENERGY CORP Stock $btu

$btu Overview Financials Valuation SEC Filings Company Website

2010 Q4 Form 10-K Financial Statement

#000106472812000020 Filed on February 27, 2012

Income Statement

Concept	2010 Q4	2010 Q3	2010 Q2
Revenue	$1.793B	$1.827B	$1.630B
YoY Change	15.35%	9.58%	21.8%
Cost Of Revenue	$1.111B	$1.243B	$1.175B
YoY Change	-4.18%	-1.52%	21.12%
Gross Profit	$515.5M	$621.4M	$486.7M
YoY Change	30.61%	53.62%	32.15%
Gross Profit Margin	28.76%	34.02%	29.86%
Selling, General & Admin	$84.20M	$54.10M	$65.00M
YoY Change	27.19%	-19.25%	17.75%
% of Gross Profit	16.33%	8.71%	13.36%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$102.2M	$116.7M	$105.1M
YoY Change	7.58%	8.06%	3.85%
% of Gross Profit	19.83%	18.78%	21.59%
Operating Expenses	$186.4M	$54.10M	$170.1M
YoY Change	12.36%	-69.09%	8.76%
Operating Profit	$326.3M	$447.3M	$325.7M
YoY Change	42.61%	94.9%	53.7%
Interest Expense	-$51.50M	$62.20M	-$49.90M
YoY Change	-45.27%	-200.16%	-6.9%
% of Operating Profit	-15.78%	13.91%	-15.32%
Other Income/Expense, Net
YoY Change
Pretax Income	$292.1M	$385.3M	$268.1M
YoY Change	106.14%	126.38%	59.2%
Income Tax	$56.50M	$147.7M	$53.40M
% Of Pretax Income	19.34%	38.33%	19.92%
Net Earnings	$210.0M	$224.1M	$206.2M
YoY Change	127.77%	109.83%	160.35%
Net Earnings / Revenue	11.71%	12.27%	12.65%
Basic Earnings Per Share		$0.84
Diluted Earnings Per Share	$11.24M	$0.83	$11.52M
COMMON SHARES
Basic Shares Outstanding	267.7M shares	267.1M shares	266.6M shares
Diluted Shares Outstanding	270.3M shares	268.6M shares	268.3M shares

Balance Sheet

Concept	2010 Q4	2010 Q3	2010 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.295B	$1.368B	$1.157B
YoY Change	30.94%	72.95%	159.42%
Cash & Equivalents	$1.295B	$1.368B	$1.157B
Short-Term Investments
Other Short-Term Assets	$467.1M	$568.0M	$416.0M
YoY Change	-18.34%	-5.49%	-35.5%
Inventory	$327.2M	$396.0M	$363.0M
Prepaid Expenses
Receivables	$555.8M	$583.0M	$394.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.958B	$2.915B	$2.330B
YoY Change	35.14%	39.54%	25.4%
LONG-TERM ASSETS
Property, Plant & Equipment	$7.263B	$7.219B	$7.246B
YoY Change	0.02%	-0.12%	-0.92%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$2.700M	$838.0M	$521.0M
YoY Change	-99.47%	54.61%	15.27%
Other Assets	$1.027B
YoY Change
Total Long-Term Assets	$8.405B	$8.058B	$7.768B
YoY Change	8.22%	3.69%	0.04%
TOTAL ASSETS
Total Short-Term Assets	$2.958B	$2.915B	$2.330B
Total Long-Term Assets	$8.405B	$8.058B	$7.768B
Total Assets	$11.36B	$10.97B	$10.10B
YoY Change	14.14%	11.29%	4.94%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.289B	$1.318B	$1.101B
YoY Change	232.22%	298.19%	213.68%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$43.00M	$42.00M	$35.00M
YoY Change	207.14%	200.0%	118.75%
Total Short-Term Liabilities	$1.514B	$1.411B	$1.216B
YoY Change	15.37%	6.65%	-7.32%
LONG-TERM LIABILITIES
Long-Term Debt	$2.707B	$2.715B	$2.728B
YoY Change	-1.13%	-1.74%	-1.37%
Other Long-Term Liabilities	$453.6M	$1.820B	$1.863B
YoY Change	-75.48%	10.77%	8.57%
Total Long-Term Liabilities	$453.6M	$4.535B	$4.591B
YoY Change	-90.11%	2.93%	2.43%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.514B	$1.411B	$1.216B
Total Long-Term Liabilities	$453.6M	$4.535B	$4.591B
Total Liabilities	$6.674B	$6.519B	$6.143B
YoY Change	7.54%	7.24%	1.82%
SHAREHOLDERS EQUITY
Retained Earnings	$2.878B
YoY Change
Common Stock	$2.182B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$334.6M
YoY Change
Treasury Stock Shares	8.900M shares
Shareholders Equity	$4.661B	$4.454B	$3.955B
YoY Change
Total Liabilities & Shareholders Equity	$11.36B	$10.97B	$10.10B
YoY Change	14.14%	11.29%	4.94%

Cashflow Statement

Concept	2010 Q4	2010 Q3	2010 Q2
OPERATING ACTIVITIES
Net Income	$210.0M	$224.1M	$206.2M
YoY Change	127.77%	109.83%	160.35%
Depreciation, Depletion And Amortization	$102.2M	$116.7M	$105.1M
YoY Change	7.58%	8.06%	3.85%
Cash From Operating Activities	$194.9M	$427.8M	$292.6M
YoY Change	-49.1%	-1.84%	631.5%
INVESTING ACTIVITIES
Capital Expenditures	-$254.7M	-$103.8M	-$99.10M
YoY Change	6.35%	67.42%	114.5%
Acquisitions
YoY Change
Other Investing Activities	-$25.60M	-$85.80M	-$21.90M
YoY Change	-123.38%	1283.87%	-60.96%
Cash From Investing Activities	-$280.3M	-$189.6M	-$121.0M
YoY Change	115.62%	178.01%	18.28%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	13.10M	-27.70M	-40.00M
YoY Change	-123.86%	21.49%	117.39%
NET CHANGE
Cash From Operating Activities	194.9M	427.8M	292.6M
Cash From Investing Activities	-280.3M	-189.6M	-121.0M
Cash From Financing Activities	13.10M	-27.70M	-40.00M
Net Change In Cash	-72.30M	210.5M	131.6M
YoY Change	-136.52%	-38.95%	-263.07%
FREE CASH FLOW
Cash From Operating Activities	$194.9M	$427.8M	$292.6M
Capital Expenditures	-$254.7M	-$103.8M	-$99.10M
Free Cash Flow	$449.6M	$531.6M	$391.7M
YoY Change	-27.76%	6.79%	354.41%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2009	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	668000000	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-700000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12200000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	113900000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	103400000	USD
CY2011	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	58900000	USD
CY2009	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	50000000	USD
CY2010	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	78800000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	51000000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	193700000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	174500000	USD
CY2009	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1700000	USD
CY2010Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	2750000000	USD
CY2011Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	6657500000	USD
CY2011Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	732500000	USD
CY2011Q4	us-gaap	Debt Instrument Convertible Conversion Price1 DebtInstrumentConvertibleConversionPrice1	75.65
CY2010	us-gaap	Debt Instrument Convertible Effective Interest Rate DebtInstrumentConvertibleEffectiveInterestRate	0.049
CY2011	us-gaap	Debt Instrument Convertible Effective Interest Rate DebtInstrumentConvertibleEffectiveInterestRate	0.049
CY2009	us-gaap	Debt Instrument Convertible Effective Interest Rate DebtInstrumentConvertibleEffectiveInterestRate	0.049
CY2011Q4	us-gaap	Debt Instrument Convertible Remaining Discount Amortization Period DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod	30	years
CY2011Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.0226
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	138000000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	47900000	USD
CY2009	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	56000000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	55600000	USD
CY2011	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	42800000	USD
CY2009	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	78500000	USD
CY2010	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	68100000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	135200000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	121700000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	188700000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	70700000	USD
CY2009	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	135200000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	180600000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5700000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7900000	USD
CY2009	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1188700000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1129600000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	0	USD
CY2010Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	30600000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-526900000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-424700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	27300000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	120400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	23500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	109300000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	57900000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	45400000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	53500000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	53300000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	15600000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	15500000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	427700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	485400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	114600000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	97800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1635800000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1489300000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	45500000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	135500000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	132500000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	554200000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	545100000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1246800000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1348000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	769600000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	771600000	USD
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities	0.4
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities	0.6
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Real Estate DefinedBenefitPlanTargetAllocationPercentageOfAssetsRealEstate	0.03
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	437100000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	400500000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	482200000	USD
CY2011Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	313800000	USD
CY2010Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	299300000	USD
CY2011Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	240700000	USD
CY2010Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	393600000	USD
CY2009	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-134600000	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
CY2009	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	700000	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
CY2009	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	523700000	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
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	11400000	USD
CY2010Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	12000000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	19500000	USD
CY2010Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	600000	USD
CY2009	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	36800000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	33500000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	86500000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	22300000	USD
CY2009	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	17000000	USD
CY2010	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	9100000	USD
CY2009	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	466900000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	121600000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	205800000	USD
CY2009	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	66800000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	92100000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	79400000	USD
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.68
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.53
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.88
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.84
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2011	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	11100000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	22200000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	8700000	USD
CY2011Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	30300000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition	3.0	years
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	16300000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15400000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	0	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	128600000	USD
CY2009	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	0	USD
CY2010Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2700000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	526600000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	51000000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	8100000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15000000	USD
CY2009	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2011Q4	us-gaap	Financing Receivable FinancingReceivable	376100000	USD
CY2011	us-gaap	Gain Loss On Disposition Of Property GainLossOnDispositionOfProperty	76900000	USD
CY2009	us-gaap	Gain Loss On Disposition Of Property GainLossOnDispositionOfProperty	23200000	USD
CY2010	us-gaap	Gain Loss On Disposition Of Property GainLossOnDispositionOfProperty	30000000	USD
CY2011	us-gaap	Gain Loss On Sale Of Proved Property GainLossOnSaleOfProvedProperty	31700000	USD
CY2011Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	2223900000	USD
CY2011Q4	us-gaap	Hedging Liabilities Current HedgingLiabilitiesCurrent	7900000	USD
CY2010Q4	us-gaap	Hedging Liabilities Current HedgingLiabilitiesCurrent	2900000	USD
CY2011Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	USD
CY2010Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	USD
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	798400000	USD
CY2009	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	428400000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	1021900000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	281400000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	535500000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	815700000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1142000000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	629400000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1373700000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	348000000	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
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1010500000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	826600000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	443200000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	222500000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	285600000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	307800000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	194600000	USD
CY2010Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	215700000	USD
CY2010Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	239300000	USD
CY2010Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	223800000	USD
CY2010Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	147800000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.97
CY2009	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.60
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.77
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.03
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.93
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.11
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.71
CY2010Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.77
CY2010Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.84
CY2010Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.54
CY2010Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.81
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.93
CY2009	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.59
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.76
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.10
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.70
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.02
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.92
CY2010Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.80
CY2010Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.84
CY2010Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.54
CY2010Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.77
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	19800000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-24400000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-64200000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-64200000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-24400000	USD
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	19800000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.09
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.08
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.24
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.24
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.09
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.07
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-69100000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1700000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-19200000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	186200000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	363200000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	315400000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	15400000	USD
CY2010	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-28700000	USD
CY2009	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	17300000	USD
CY2011	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-99200000	USD
CY2009	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-83400000	USD
CY2010	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-124500000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	220300000	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
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-53500000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-70800000	USD
CY2009	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-44000000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	4500000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	11800000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	21100000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	450700000	USD
CY2010	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	84500000	USD
CY2009	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	0	USD
CY2011	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	7600000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3400000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-4800000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12300000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	12200000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	17000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	17800000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	148400000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	170600000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	275100000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-120400000	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
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	221000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	149400000	USD
CY2009	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-102500000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	104600000	USD
CY2009	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	20400000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	0	USD
CY2011	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	30900000	USD
CY2010	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	31200000	USD
CY2009	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	27500000	USD
CY2011	us-gaap	Increase Decrease In Due To Related Parties IncreaseDecreaseInDueToRelatedParties	-371300000	USD
CY2009	us-gaap	Increase Decrease In Due To Related Parties IncreaseDecreaseInDueToRelatedParties	0	USD
CY2010	us-gaap	Increase Decrease In Due To Related Parties IncreaseDecreaseInDueToRelatedParties	0	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	46800000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	8500000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	50400000	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
CY2009	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	1900000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	4900000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	19400000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	8900000	USD
CY2010	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	23100000	USD
CY2009	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	7200000	USD
CY2011	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	35400000	USD
CY2009	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	3000000	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
CY2011	us-gaap	Interest Expense InterestExpense	238600000	USD
CY2009	us-gaap	Interest Expense InterestExpense	201100000	USD
CY2010	us-gaap	Interest Expense InterestExpense	222000000	USD
CY2009	us-gaap	Interest Expense Debt InterestExpenseDebt	34800000	USD
CY2011	us-gaap	Interest Expense Debt InterestExpenseDebt	34800000	USD
CY2010	us-gaap	Interest Expense Debt InterestExpenseDebt	34800000	USD
CY2009	us-gaap	Interest Paid InterestPaid	201600000	USD
CY2011	us-gaap	Interest Paid InterestPaid	205300000	USD
CY2010	us-gaap	Interest Paid InterestPaid	197900000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	49500000	USD
CY2010Q4	us-gaap	Interest Payable Current InterestPayableCurrent	30500000	USD
CY2010Q4	us-gaap	Inventory Net InventoryNet	327200000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	446300000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	124900000	USD
CY2010Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	94500000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	18900000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	9600000	USD
CY2009	us-gaap	Investment Income Interest InvestmentIncomeInterest	8100000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	11217200000	USD
CY2010Q4	us-gaap	Liabilities Liabilities	6673800000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	11363100000	USD
CY2011Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	259800000	USD
CY2011Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	29400000	USD
CY2010	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	0	USD
CY2011	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	-145400000	USD
CY2009	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	0	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	129500000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	116600000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	170600000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	16733000000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1513700000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1823700000	USD
CY2011Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	86300000	USD
CY2010Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	43300000	USD
CY2010Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	29400000	USD
CY2011Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	63900000	USD
CY2010Q2	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	2000000000	USD
CY2010Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	2706800000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6556400000	USD
CY2010Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	43200000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	101100000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	4392500000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	101100000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1475700000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	458500000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	107800000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	121900000	USD
CY2011Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	2862400000	USD
CY2010Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	1664500000	USD
CY2010Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	490700000	USD
CY2011Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	621300000	USD
CY2010Q4	us-gaap	Minority Interest MinorityInterest	28600000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	30700000	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
CY2009	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	10000000	USD
CY2011	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	1994800000	USD
CY2011	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:16px;padding-top:9px;text-align:justify;text-indent:32px;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, and include equity-affiliate mining operations in Australia and Venezuela. The Company also markets, brokers coal sales of other coal producers both as principal and agent, and trades coal, freight and freight-related contracts. The Company’s other energy related commercial activities include participating in the development 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>
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-77100000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-104600000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1678500000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-406500000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-703600000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3807800000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-407400000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-3745500000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-694500000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1633200000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1050200000	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 Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1658100000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1044900000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1116700000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	448200000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	957700000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	774000000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	274000000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	284800000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	222400000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	176500000	USD
CY2010Q1	us-gaap	Net Income Loss NetIncomeLoss	133700000	USD
CY2010Q4	us-gaap	Net Income Loss NetIncomeLoss	210000000	USD
CY2010Q2	us-gaap	Net Income Loss NetIncomeLoss	206200000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	224100000	USD
CY2009	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	14800000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-11400000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	28200000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	768400000	USD
CY2009	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	445300000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	952400000	USD
CY2011	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	1994800000	USD
CY2010	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2009	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2010Q4	us-gaap	Notes Payable Related Parties Noncurrent NotesPayableRelatedPartiesNoncurrent	0	USD
CY2011Q4	us-gaap	Notes Payable Related Parties Noncurrent NotesPayableRelatedPartiesNoncurrent	0	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	822400000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	1593400000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	1354400000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	418300000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	479300000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	314300000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	381500000	USD
CY2010Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	326300000	USD
CY2010Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	255100000	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	447300000	USD
CY2010Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	325700000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	610900000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	123100000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	63500000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	76400000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	90600000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	106200000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	151100000	USD
CY2010Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	179900000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	286700000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	766100000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	467100000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	2364400000	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1026800000	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
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
CY2009	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	1800000	USD
CY2010	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	0	USD
CY2009	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
CY2011	us-gaap	Other Comprehensive Income Available For Sale Securities Tax OtherComprehensiveIncomeAvailableForSaleSecuritiesTax	-3900000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	-6500000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	4900000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	-900000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	108700000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	114800000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	11900000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-41300000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-134900000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-150100000	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
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	71800000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	127500000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	319800000	USD
CY2009	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	15000000	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	39700000	USD
CY2010	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	74600000	USD
CY2009	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	40900000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	220900000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	129500000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	-6200000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	205000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	115600000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-74500000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2009	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
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	251000000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	102400000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-84600000	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
CY2009	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	11800000	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
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	291900000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	235200000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	229900000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-6700000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	608500000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	453600000	USD
CY2011Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	43400000	USD
CY2010Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	45800000	USD
CY2010Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	963900000	USD
CY2011Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	1053100000	USD
CY2010	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	528700000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	883100000	USD
CY2009	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	543900000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6100000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	8800000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6600000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	32200000	USD
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	61500000	USD
CY2009	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	79400000	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	66800000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	92100000	USD
CY2010	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
CY2009	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
CY2009	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	56800000	USD
CY2010	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	76000000	USD
CY2010	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	18800000	USD
CY2011	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	147700000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	846900000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	547900000	USD
CY2009	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	383400000	USD
CY2009	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	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
CY2009	us-gaap	Pension Contributions PensionContributions	38700000	USD
CY2010	us-gaap	Pension Contributions PensionContributions	112600000	USD
CY2011	us-gaap	Pension Contributions PensionContributions	46700000	USD
CY2011	us-gaap	Pension Expense PensionExpense	31100000	USD
CY2010	us-gaap	Pension Expense PensionExpense	23300000	USD
CY2009	us-gaap	Pension Expense PensionExpense	3300000	USD
CY2011	us-gaap	Preferred Stock Call Or Exercise Features PreferredStockCallOrExerciseFeatures	The Right is exercisable only if a person or group acquires 15% or more of the Company’s common stock
CY2011	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.030875
CY2009	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	2900000	USD
CY2011	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	5300000	USD
CY2010	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	5600000	USD
CY2011Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2011Q4	us-gaap	Preferred Stock Redemption Price Per Share PreferredStockRedemptionPricePerShare	0.001
CY2009	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2011	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	4101400000	USD
CY2010	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	1150000000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	100000000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	0	USD
CY2009	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	0	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
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1600000	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
CY2009	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	52800000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	19200000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	40100000	USD
CY2009	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	53900000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	802200000	USD
CY2009	us-gaap	Profit Loss ProfitLoss	463000000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	946300000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	178700000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	292200000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	194000000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	281400000	USD
CY2010Q1	us-gaap	Profit Loss ProfitLoss	136700000	USD
CY2010Q4	us-gaap	Profit Loss ProfitLoss	215000000	USD
CY2010Q3	us-gaap	Profit Loss ProfitLoss	236300000	USD
CY2010Q2	us-gaap	Profit Loss ProfitLoss	214200000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	7378100000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11362700000	USD
CY2010Q4	us-gaap	Related Party Transaction Due From To Related Party Current RelatedPartyTransactionDueFromToRelatedPartyCurrent	0	USD
CY2011Q4	us-gaap	Related Party Transaction Due From To Related Party Current RelatedPartyTransactionDueFromToRelatedPartyCurrent	0	USD
CY2011	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	331700000	USD
CY2009	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	0	USD
CY2010	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	0	USD
CY2009	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	37100000	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
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2878400000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3744000000	USD
CY2010	us-gaap	Revenues Revenues	6739900000	USD
CY2011	us-gaap	Revenues Revenues	7974400000	USD
CY2009	us-gaap	Revenues Revenues	5847000000	USD
CY2011Q2	us-gaap	Revenues Revenues	1980500000	USD
CY2011Q1	us-gaap	Revenues Revenues	1743100000	USD
CY2010Q4	us-gaap	Revenues Revenues	1792700000	USD
CY2010Q1	us-gaap	Revenues Revenues	1490600000	USD
CY2010	us-gaap	Royalty Expense RoyaltyExpense	540600000	USD
CY2011	us-gaap	Royalty Expense RoyaltyExpense	610600000	USD
CY2009	us-gaap	Royalty Expense RoyaltyExpense	428600000	USD
CY2011Q3	us-gaap	Revenues Revenues	1997200000	USD
CY2011Q4	us-gaap	Revenues Revenues	2253600000	USD
CY2010Q3	us-gaap	Revenues Revenues	1826700000	USD
CY2010Q2	us-gaap	Revenues Revenues	1629900000	USD
CY2011	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	268200000	USD
CY2009	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	199100000	USD
CY2010	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	232200000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	43900000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	41100000	USD
CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	38800000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	131867	shares
CY2011Q4	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	47.10
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	618124	shares
CY2011	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	59.63
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1531092	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1894299	shares
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
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	39.32
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	849464	shares
CY2011	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	42.38
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.006
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.006
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.009
CY2011	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
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.0	years
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.60
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.64
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.64
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.028
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.020
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.015
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	6000000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	13800000	shares
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
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	14700000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	800000	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	700000	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	600000	shares
CY2011Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Estimated Range Of Change Upper Bound SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound	30000000	USD
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
CY2009	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	400000	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	300000	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1500000	shares
CY2009	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	500000	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
CY2009	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5100000	USD
CY2009	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3600000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4800000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	16400000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	4660700000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	5485100000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5515800000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4689300000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3755900000	USD
CY2008Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3119500000	USD
CY2010Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	8900000	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	9200000	shares
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	334600000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	353300000	USD
CY2011	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	299600000	USD
CY2008	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	199800000	USD
CY2006	us-gaap	Treasury Stock Value Acquired Par Value Method TreasuryStockValueAcquiredParValueMethod	99800000	USD
CY2011Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	99900000	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	119600000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	111000000	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	186300000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	113200000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	8600000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	88500000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	19400000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3400000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5200000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2700000	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
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	15700000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	14600000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	26000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	11400000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2011Q3	us-gaap	Unusual Or Infrequent Item Gross UnusualOrInfrequentItemGross	122900000	USD
CY2011Q4	us-gaap	Unusual Or Infrequent Item Gross UnusualOrInfrequentItemGross	111800000	USD
CY2011	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:16px;padding-top:9px;text-align:justify;text-indent:32px;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>
CY2011Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	79800000	USD
CY2010Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	65000000	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
CY2009	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2000000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	269900000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270300000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	267500000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	272800000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270500000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270200000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270600000	shares
CY2010Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	268200000	shares
CY2010Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	270300000	shares
CY2010Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	268300000	shares
CY2010Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	268600000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	265500000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269100000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	267000000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	268900000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269300000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269000000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	269200000	shares
CY2010Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	267700000	shares
CY2010Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	267100000	shares
CY2010Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	266500000	shares
CY2010Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	266600000	shares
CY2011Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	17300000	USD
CY2010Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	14600000	USD
CY2011	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	8400000	USD
CY2011Q4	btu	Accrued Health Care AccruedHealthCare	77800000	USD
CY2010Q4	btu	Accrued Health Care AccruedHealthCare	85900000	USD
CY2010Q4	btu	Accrued Payroll And Related Benefits AccruedPayrollAndRelatedBenefits	152100000	USD
CY2011Q4	btu	Accrued Payroll And Related Benefits AccruedPayrollAndRelatedBenefits	183300000	USD
CY2011Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-464900000	USD
CY2010Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-353000000	USD
CY2008Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-220400000	USD
CY2009Q4	btu	Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Workers Compensation Obligation Net Of Tax AccumulatedOtherComprehensiveIncomeLossActurialLossAssociatedWithWorkersCompensationObligationNetOfTax	-343500000	USD
CY2008Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	-18700000	USD
CY2010Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	-12800000	USD
CY2009Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	-10400000	USD
CY2011Q4	btu	Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net Of Tax AccumulatedOtherComprehensiveIncomeLossPriorServiceCostCreditArisingDuringPeriodNetOfTax	-9600000	USD
CY2011	btu	Accumulated Other Comprehensive Loss Net Change In Fair Value Of Cash Flow Hedges AccumulatedOtherComprehensiveLossNetChangeInFairValueOfCashFlowHedges	286100000	USD
CY2009	btu	Accumulated Other Comprehensive Loss Net Change In Fair Value Of Cash Flow Hedges AccumulatedOtherComprehensiveLossNetChangeInFairValueOfCashFlowHedges	235200000	USD
CY2010	btu	Accumulated Other Comprehensive Loss Net Change In Fair Value Of Cash Flow Hedges AccumulatedOtherComprehensiveLossNetChangeInFairValueOfCashFlowHedges	229900000	USD
CY2011	btu	Additional Borrowing Capacity Under Revolving Credit Facility AdditionalBorrowingCapacityUnderRevolvingCreditFacility	250000000	USD
CY2011	btu	Additional Cash Upon Collection Of Underlying Receivables AdditionalCashUponCollectionOfUnderlyingReceivables	1004800000	USD
CY2010	btu	Additional Discretionary Contributions To Defined Contribution Pension Plans AdditionalDiscretionaryContributionsToDefinedContributionPensionPlans	20600000	USD
CY2009	btu	Additional Discretionary Contributions To Defined Contribution Pension Plans AdditionalDiscretionaryContributionsToDefinedContributionPensionPlans	20300000	USD
CY2011	btu	Additional Discretionary Contributions To Defined Contribution Pension Plans AdditionalDiscretionaryContributionsToDefinedContributionPensionPlans	22500000	USD
CY2011Q1	btu	Adjusted Conversion Price Of Debentures Per Share AdjustedConversionPriceOfDebenturesPerShare	58.19
CY2011Q4	btu	Aggregate Principal Outstanding Of Convertible Junior Subordinated Debentures AggregatePrincipalOutstandingOfConvertibleJuniorSubordinatedDebentures	732500000	USD
CY2011Q4	btu	Amount Available For Repurchase Of Shares Under Share Repurchase Program AmountAvailableForRepurchaseOfSharesUnderShareRepurchaseProgram	700400000	USD
CY2011Q4	btu	Amount Available Under Securitization Program AmountAvailableUnderSecuritizationProgram	41700000	USD
CY2011Q4	btu	Amount In Letters Of Credit And Surety Bonds Related To Collateral For Surety Companies Road Maintenance Performance Guarantees And Other Operations AmountInLettersOfCreditAndSuretyBondsRelatedToCollateralForSuretyCompaniesRoadMaintenancePerformanceGuaranteesAndOtherOperations	242200000	USD
CY2011Q4	btu	Asset Retirement Obligation Active Locations AssetRetirementObligationActiveLocations	574000000	USD
CY2010Q4	btu	Asset Retirement Obligation Active Locations AssetRetirementObligationActiveLocations	438200000	USD
CY2011Q4	btu	Asset Retirement Obligation Closed Or Inactive Locations AssetRetirementObligationClosedOrInactiveLocations	47300000	USD
CY2010Q4	btu	Asset Retirement Obligation Closed Or Inactive Locations AssetRetirementObligationClosedOrInactiveLocations	52500000	USD
CY2011Q4	btu	Assets From Coal Trading Activities Net AssetsFromCoalTradingActivitiesNet	44600000	USD
CY2010Q4	btu	Assets From Coal Trading Activities Net AssetsFromCoalTradingActivitiesNet	192500000	USD
CY2010	btu	Business Acquisition Percentage Of Agreed Sale Price As Consideration BusinessAcquisitionPercentageOfAgreedSalePriceAsConsideration	0.20
CY2010	btu	Business Acquisition Percentage Of Agreed Sale Price As Final Installment Payment BusinessAcquisitionPercentageOfAgreedSalePriceAsFinalInstallmentPayment	0.40
CY2010	btu	Business Acquisition Percentage Of Agreed Sale Price As Installment Payment BusinessAcquisitionPercentageOfAgreedSalePriceAsInstallmentPayment	0.40
CY2011	btu	Capacity Of New Electricity Generation Project CapacityOfNewElectricityGenerationProject	1600
CY2011	btu	Cash Proceeds From Sale Of Nonstrategic Coal Reserves CashProceedsFromSaleOfNonstrategicCoalReserves	24900000	USD
CY2011	btu	Cash Up Front From Sale Of Receivables CashUpFrontFromSaleOfReceivables	3462700000	USD
CY2010	btu	Changes In Tax Reserves ChangesInTaxReserves	0	USD
CY2009	btu	Changes In Tax Reserves ChangesInTaxReserves	5900000	USD
CY2011	btu	Changes In Tax Reserves ChangesInTaxReserves	14700000	USD
CY2011Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDue	227800000	USD
CY2011Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Five Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInFiveYears	3800000	USD
CY2011Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Four Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInFourYears	46600000	USD
CY2011Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Three Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInThreeYears	48800000	USD
CY2011Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due In Two Years CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueInTwoYears	50000000	USD
CY2011Q4	btu	Coal Lease And Royalty Obligation Capital Leases Future Minimum Payments Due Thereafter CoalLeaseAndRoyaltyObligationCapitalLeasesFutureMinimumPaymentsDueThereafter	27900000	USD
CY2011Q4	btu	Coal Lease And Royalty Obligation Future Minimum Payments Due Current CoalLeaseAndRoyaltyObligationFutureMinimumPaymentsDueCurrent	50700000	USD
CY2010Q4	btu	Coal Reserves CoalReserves	5000000000	USD
CY2011Q4	btu	Coal Reserves CoalReserves	7700000000	USD
CY2011Q4	btu	Coal Reserves Not Subject To Depletion CoalReservesNotSubjectToDepletion	2700000000	USD
CY2010Q4	btu	Coal Reserves Not Subject To Depletion CoalReservesNotSubjectToDepletion	1300000000	USD
CY2011Q4	btu	Common Stock Discount Under Employee Stock Purchase Plans CommonStockDiscountUnderEmployeeStockPurchasePlans	0.15
CY2011Q4	btu	Company Lease Obligations CompanyLeaseObligations	104700000	USD
CY2011	btu	Consideration Received By Company Related To Securitization Program ConsiderationReceivedByCompanyRelatedToSecuritizationProgram	4633400000	USD
CY2011	btu	Consideration Received By Company Upon Completion Of Sell Down ConsiderationReceivedByCompanyUponCompletionOfSellDown	15000000	AUD
CY2011Q4	btu	Conversation Of Debt Maximum Deferral Period ConversationOfDebtMaximumDeferralPeriod	10
CY2011	btu	Convertible Debt Condition One For Debt Conversion ConvertibleDebtConditionOneForDebtConversion	1.400
CY2011	btu	Convertible Debt Conversion Period Description ConvertibleDebtConversionPeriodDescription	1.30
CY2011Q4	btu	Credit Adjusted Risk Free Interest Rates CreditAdjustedRiskFreeInterestRates	0.0576
CY2010Q4	btu	Credit Adjusted Risk Free Interest Rates CreditAdjustedRiskFreeInterestRates	0.0637
CY2009Q4	btu	Credit Adjusted Risk Free Interest Rates CreditAdjustedRiskFreeInterestRates	0.0792
CY2011Q1	btu	Current Conversion Amount Per Principal Amount Of Debentures CurrentConversionAmountPerPrincipalAmountOfDebentures	1000	USD
CY2011	btu	Current Conversion Price Of Debentures Per Share CurrentConversionPriceOfDebenturesPerShare	81.47
CY2011Q1	btu	Debt Instrument Convertible Conversion Rate Per Share DebtInstrumentConvertibleConversionRatePerShare	17.1846
CY2011	btu	Debt Instrument Default Periodic Rate Change DebtInstrumentDefaultPeriodicRateChange	0.0025
CY2011	btu	Debt Instrument Default Rate Change Maximum DebtInstrumentDefaultRateChangeMaximum	0.010
CY2011	btu	Debt Instrument Periodic Payment Interest Rate DebtInstrumentPeriodicPaymentInterestRate	0.0475
CY2011Q4	btu	Debt Instrument Quarterly Amortization Percentage DebtInstrumentQuarterlyAmortizationPercentage	0.0125
CY2011Q4	btu	Deferred Tax Assets Financial Guarantee DeferredTaxAssetsFinancialGuarantee	18500000	USD
CY2010Q4	btu	Deferred Tax Assets Financial Guarantee DeferredTaxAssetsFinancialGuarantee	18800000	USD
CY2010Q4	btu	Deferred Tax Assets Intangible Tax Asset And Purchased Contract Rights DeferredTaxAssetsIntangibleTaxAssetAndPurchasedContractRights	15100000	USD
CY2011Q4	btu	Deferred Tax Assets Intangible Tax Asset And Purchased Contract Rights DeferredTaxAssetsIntangibleTaxAssetAndPurchasedContractRights	10600000	USD
CY2010Q4	btu	Deferred Tax Assets Investments In Subsidiaries DeferredTaxAssetsInvestmentsInSubsidiaries	1100000000	USD
CY2011Q4	btu	Deferred Tax Assets Investments In Subsidiaries DeferredTaxAssetsInvestmentsInSubsidiaries	1300000000	USD
CY2010Q4	btu	Deferred Tax Assets Tax Credit And Operating Loss Carryforwards DeferredTaxAssetsTaxCreditAndOperatingLossCarryforwards	425200000	USD
CY2011Q4	btu	Deferred Tax Assets Tax Credit And Operating Loss Carryforwards DeferredTaxAssetsTaxCreditAndOperatingLossCarryforwards	432800000	USD
CY2011	btu	Deferred Tax Assets Tax Credit Carryforwards General Business And Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusinessAndAlternativeMinimumTax	300000000	USD
CY2011Q4	btu	Deferred Tax Liabilities Investments And Other Assets DeferredTaxLiabilitiesInvestmentsAndOtherAssets	109800000	USD
CY2010Q4	btu	Deferred Tax Liabilities Investments And Other Assets DeferredTaxLiabilitiesInvestmentsAndOtherAssets	107000000	USD
CY2009	btu	Depreciation And Depletion DepreciationAndDepletion	388000000	USD
CY2010	btu	Depreciation And Depletion DepreciationAndDepletion	424800000	USD
CY2011	btu	Depreciation And Depletion DepreciationAndDepletion	473700000	USD
CY2011	btu	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition Weighted Average EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionWeightedAverage	0.8	years
CY2011Q4	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
CY2011Q4	btu	Entity Number Of Hourly Employees EntityNumberOfHourlyEmployees	5600
CY2011Q2	btu	Equity Interest Converted From Receivable Per Agreement EquityInterestConvertedFromReceivablePerAgreement	0.90
CY2011Q4	btu	Equity Interest Converted From Receivable Per Court Ruling EquityInterestConvertedFromReceivablePerCourtRuling	0.90
CY2011	btu	Events Triggering Payment Of Deferred Interest On Debentures EventsTriggeringPaymentOfDeferredInterestOnDebentures	After five years of deferral at the Company’s option, or upon the occurrence of a mandatory trigger event
CY2010	btu	Expenses Associated With Securitization Transactions ExpensesAssociatedWithSecuritizationTransactions	2400000	USD
CY2011	btu	Expenses Associated With Securitization Transactions ExpensesAssociatedWithSecuritizationTransactions	2000000	USD
CY2009	btu	Expenses Associated With Securitization Transactions ExpensesAssociatedWithSecuritizationTransactions	4000000	USD
CY2011	btu	Expenses Related To Take Or Pay Arrangements ExpensesRelatedToTakeOrPayArrangements	284200000	USD
CY2010Q4	btu	Fair Value Hedge Adjustment FairValueHedgeAdjustment	2200000	USD
CY2011Q4	btu	Fair Value Hedge Adjustment FairValueHedgeAdjustment	0	USD
CY2009	btu	Foreign Currency Remeasurement Gains Losses ForeignCurrencyRemeasurementGainsLosses	-55400000	USD
CY2011	btu	Foreign Currency Remeasurement Gains Losses ForeignCurrencyRemeasurementGainsLosses	-900000	USD
CY2010	btu	Foreign Currency Remeasurement Gains Losses ForeignCurrencyRemeasurementGainsLosses	-38500000	USD
CY2011	btu	Foreign Earnings On Which Deferred Taxes Has Not Provided ForeignEarningsOnWhichDeferredTaxesHasNotProvided	1300000000	USD
CY2010	btu	Foreign Earnings On Which Deferred Taxes Has Not Provided ForeignEarningsOnWhichDeferredTaxesHasNotProvided	1100000000	USD
CY2011	btu	Fronting Fee As Percentage Of Face Amount Of Each Letter Of Credit FrontingFeeAsPercentageOfFaceAmountOfEachLetterOfCredit	0.00125
CY2011Q4	btu	Funds Remaining With Mf Global FundsRemainingWithMfGlobal	53000000	USD
CY2011	btu	Goals To Be Achieved Under Performance Units Awards Based On Return On Capital Target GoalsToBeAchievedUnderPerformanceUnitsAwardsBasedOnReturnOnCapitalTarget	0.50
CY2011	btu	Goals To Be Achieved Under Performance Units Awards Based On Stock Price Performance GoalsToBeAchievedUnderPerformanceUnitsAwardsBasedOnStockPricePerformance	0.50
CY2010	btu	Income From Continuing Operations Attributable To Common Stockholders IncomeFromContinuingOperationsAttributableToCommonStockholders	792800000	USD
CY2009	btu	Income From Continuing Operations Attributable To Common Stockholders IncomeFromContinuingOperationsAttributableToCommonStockholders	425500000	USD
CY2011	btu	Income From Continuing Operations Attributable To Common Stockholders IncomeFromContinuingOperationsAttributableToCommonStockholders	1016600000	USD
CY2011	btu	Interest Rate Over And Above Libor Rate InterestRateOverAndAboveLiborRate	0.020
CY2010Q4	btu	Land And Coal Interests LandAndCoalInterests	7633800000	USD
CY2011Q4	btu	Land And Coal Interests LandAndCoalInterests	10781000000	USD
CY2011	btu	Lease Term LeaseTerm	ten years
CY2011	btu	Letter Of Credit Fee As Percentage Of Undrawn Amount Of Each Letter Of Credit Higher Range LetterOfCreditFeeAsPercentageOfUndrawnAmountOfEachLetterOfCreditHigherRange	0.0350
CY2011	btu	Letter Of Credit Fee As Percentage Of Undrawn Amount Of Each Letter Of Credit Lower Range LetterOfCreditFeeAsPercentageOfUndrawnAmountOfEachLetterOfCreditLowerRange	0.0225
CY2010Q4	btu	Letters Of Credit In Support Of Reclamation Obligations LettersOfCreditInSupportOfReclamationObligations	100000	USD
CY2010Q4	btu	Liabilities From Coal Trading Activities Net LiabilitiesFromCoalTradingActivitiesNet	181700000	USD
CY2011Q4	btu	Liabilities From Coal Trading Activities Net LiabilitiesFromCoalTradingActivitiesNet	10300000	USD
CY2011	btu	Line Of Credit Facility Commitment Fee Percent Maximum LineOfCreditFacilityCommitmentFeePercentMaximum	0.00500
CY2011	btu	Line Of Credit Facility Commitment Fee Percent Minimum LineOfCreditFacilityCommitmentFeePercentMinimum	0.00375
CY2011	btu	Long Term Investments Maturity Period Description LongTermInvestmentsMaturityPeriodDescription	greater than 12 months
CY2011Q4	btu	Maximum Capacity Of Securitization Program MaximumCapacityOfSecuritizationProgram	275000000	USD
CY2011	btu	Maximum Common Shares Authorized For Repurchase MaximumCommonSharesAuthorizedForRepurchase	1000000000	USD
CY2011	btu	Maximum Common Shares Authorized For Repurchase Outside Share Repurchase Program MaximumCommonSharesAuthorizedForRepurchaseOutsideShareRepurchaseProgram	100000000	USD
CY2011	btu	Maximum Employee Contribution To Employee Stock Purchase Plans Based On Compensation Amount MaximumEmployeeContributionToEmployeeStockPurchasePlansBasedOnCompensationAmount	25000	USD
CY2011Q4	btu	Maximum Employee Contribution To Employee Stock Purchase Plans Based On Compensation Pecentage MaximumEmployeeContributionToEmployeeStockPurchasePlansBasedOnCompensationPecentage	0.15
CY2011	btu	Maximum Percentage Of Companys Net Cash Proceeds From Sale Of Its Common Stock And Rights To Acquire Common Stock Which Can Be Used For Repayment Of Debt MaximumPercentageOfCompanysNetCashProceedsFromSaleOfItsCommonStockAndRightsToAcquireCommonStockWhichCanBeUsedForRepaymentOfDebt	4.00
CY2011	btu	Minimum Amount Of Revolving Credit Facility Increase MinimumAmountOfRevolvingCreditFacilityIncrease	25000000	USD
CY2011	btu	Minimum Annual Production Of Coal Mining Leases On Original Amount MinimumAnnualProductionOfCoalMiningLeasesOnOriginalAmount	0.010
CY2011	btu	Mining Lease Terms MiningLeaseTerms	up to 21 years
CY2011	btu	Minority Interest Increase From Contributions To Noncontrolling Interest Holders MinorityInterestIncreaseFromContributionsToNoncontrollingInterestHolders	1200000	USD
CY2011	btu	Monthly Royalties Payable From Sale Using Surface Mining Methods MonthlyRoyaltiesPayableFromSaleUsingSurfaceMiningMethods	0.125
CY2011	btu	Monthly Royalties Payable Of Production Using Underground Mining Methods MonthlyRoyaltiesPayableOfProductionUsingUndergroundMiningMethods	0.080
CY2011	btu	Net Assets From Coal Trading Activities NetAssetsFromCoalTradingActivities	172400000	USD
CY2010	btu	Net Assets From Coal Trading Activities NetAssetsFromCoalTradingActivities	-109600000	USD
CY2009	btu	Net Assets From Coal Trading Activities NetAssetsFromCoalTradingActivities	70900000	USD
CY2011Q3	btu	Non Cash Benefit From Remeasurement Of Foreign Income Tax Accounts NonCashBenefitFromRemeasurementOfForeignIncomeTaxAccounts	38700000	USD
CY2011Q1	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	6400000	USD
CY2011Q2	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	15400000	USD
CY2011Q4	btu	Non Cash Expense From Remeasurement Of Foreign Income Tax Accounts NonCashExpenseFromRemeasurementOfForeignIncomeTaxAccounts	16000000	USD
CY2011Q4	btu	Non Collected Receivables NonCollectedReceivables	165900000	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
CY2010	btu	Number Of Common Stock Received To Pay Estimated Taxes As Consideration For Exercise Of Stock Options NumberOfCommonStockReceivedToPayEstimatedTaxesAsConsiderationForExerciseOfStockOptions	268308	shares
CY2011	btu	Number Of Common Stock Received To Pay Estimated Taxes As Consideration For Exercise Of Stock Options NumberOfCommonStockReceivedToPayEstimatedTaxesAsConsiderationForExerciseOfStockOptions	311709	shares
CY2011	btu	Number Of Defined Contribution Plans NumberOfDefinedContributionPlans	3	plans
CY2011	btu	Number Of Shares Repurchased NumberOfSharesRepurchased	7700000	shares
CY2010	btu	Operating Costs And Expense OperatingCostsAndExpense	4697300000	USD
CY2011	btu	Operating Costs And Expense OperatingCostsAndExpense	5550000000	USD
CY2009	btu	Operating Costs And Expense OperatingCostsAndExpense	4339200000	USD
CY2011Q4	btu	Other Accrued Benefits OtherAccruedBenefits	4100000	USD
CY2010Q4	btu	Other Accrued Benefits OtherAccruedBenefits	4200000	USD
CY2009	btu	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	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
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
CY2009	btu	Other Comprehensive Income Loss Current Period Change Net Of Tax OtherComprehensiveIncomeLossCurrentPeriodChangeNetOfTax	-128400000	USD
CY2010	btu	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	46200000	USD
CY2011	btu	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	149200000	USD
CY2009	btu	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	128400000	USD
CY2009	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	13600000	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
CY2009	btu	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	-98200000	USD
CY2010	btu	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	68100000	USD
CY2011	btu	Other Comprehensive Income Reclassification Adjustment Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax	211400000	USD
CY2010Q4	btu	Other Noncurrent Liability OtherNoncurrentLiability	1908200000	USD
CY2011Q4	btu	Other Noncurrent Liability OtherNoncurrentLiability	2282900000	USD
CY2009	btu	Paid Discretionary Contributions To Defined Contribution Pension Plans Company Match PaidDiscretionaryContributionsToDefinedContributionPensionPlansCompanyMatch	47900000	USD
CY2011	btu	Paid Discretionary Contributions To Defined Contribution Pension Plans Company Match PaidDiscretionaryContributionsToDefinedContributionPensionPlansCompanyMatch	54500000	USD
CY2010	btu	Paid Discretionary Contributions To Defined Contribution Pension Plans Company Match PaidDiscretionaryContributionsToDefinedContributionPensionPlansCompanyMatch	51300000	USD
CY2010	btu	Payments For Repurchase Of Common Stock Relinquished For Tax Withholding PaymentsForRepurchaseOfCommonStockRelinquishedForTaxWithholding	13500000	USD
CY2009	btu	Payments For Repurchase Of Common Stock Relinquished For Tax Withholding PaymentsForRepurchaseOfCommonStockRelinquishedForTaxWithholding	2300000	USD
CY2011	btu	Payments For Repurchase Of Common Stock Relinquished For Tax Withholding PaymentsForRepurchaseOfCommonStockRelinquishedForTaxWithholding	18700000	USD
CY2011	btu	Percentage Of Actuarial Gains And Losses Amortized PercentageOfActuarialGainsAndLossesAmortized	0.00
CY2011Q4	btu	Percentage Of Coal Production Generated By Hourly Employees Represented By Organized Labor Unions PercentageOfCoalProductionGeneratedByHourlyEmployeesRepresentedByOrganizedLaborUnions	0.07
CY2011Q4	btu	Percentage Of Companys Qualified Pension Plans On Gaap Accounting Basis PercentageOfCompanysQualifiedPensionPlansOnGaapAccountingBasis	0.80
CY2011Q4	btu	Percentage Of Employees Represented By Organized Labor Unions PercentageOfEmployeesRepresentedByOrganizedLaborUnions	0.24
CY2011	btu	Period Considered To Treat Short Term Highly Liquid Investments As Cash Equivalents PeriodConsideredToTreatShortTermHighlyLiquidInvestmentsAsCashEquivalents	three months or less
CY2011	btu	Period For Payment Of Dividend On Perpetual Preferred Stock PeriodForPaymentOfDividendOnPerpetualPreferredStock	10
CY2011	btu	Period Of Redemption Of Debentures PeriodOfRedemptionOfDebentures	at least 20 out of the 30 consecutive trading days immediately prior to the date on which notice of redemption is given
CY2011	btu	Period To Redetermine Royalty Rates On Leased Coal Reserves PeriodToRedetermineRoyaltyRatesOnLeasedCoalReserves	every ten years
CY2011	btu	Reallocation Adjustment For Participating Securities ReallocationAdjustmentForParticipatingSecurities	100000	USD
CY2010Q4	btu	Reclassification Of Self Bonding In Certain States In Which Company Qualifies ReclassificationOfSelfBondingInCertainStatesInWhichCompanyQualifies	920300000	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
CY2010Q4	btu	Previous Term Loan Facility Balance PreviousTermLoanFacilityBalance	360000000	AUD
CY2011	btu	Project Development Fee Received ProjectDevelopmentFeeReceived	14600000	USD
CY2010Q4	btu	Raw Coal RawCoal	55400000	USD
CY2011Q4	btu	Raw Coal RawCoal	95000000	USD
CY2011	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
CY2011	btu	Redemption Price Of Debt As Percentage Of Principal Amount Of Debentures RedemptionPriceOfDebtAsPercentageOfPrincipalAmountOfDebentures	1.01
CY2011	btu	Refinancing Charges Classified As Interest Expense RefinancingChargesClassifiedAsInterestExpense	9300000	USD
CY2011	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	-900000	USD
CY2009	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	74400000	USD
CY2010	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	47900000	USD
CY2010Q4	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	18900000	USD
CY2010Q2	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	-19500000	USD
CY2010Q1	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	5500000	USD
CY2010Q3	btu	Remeasurement Of Foreign Taxes RemeasurementOfForeignTaxes	43000000	USD
CY2011	btu	Sale Of Business Percentage Of Ownership Before Transaction SaleOfBusinessPercentageOfOwnershipBeforeTransaction	0.85
CY2011Q4	btu	Saleable Coal SaleableCoal	226400000	USD
CY2010Q4	btu	Saleable Coal SaleableCoal	177300000	USD
CY2011	btu	Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization SegmentReportingInformationAdjustedEarningBeforeInterestTaxesDepreciationAndAmortization	2128700000	USD
CY2010	btu	Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization SegmentReportingInformationAdjustedEarningBeforeInterestTaxesDepreciationAndAmortization	1838700000	USD
CY2009	btu	Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization SegmentReportingInformationAdjustedEarningBeforeInterestTaxesDepreciationAndAmortization	1262800000	USD
CY2009	btu	Segment Reporting Revenue Percentage SegmentReportingRevenuePercentage	1.00
CY2011	btu	Segment Reporting Revenue Percentage SegmentReportingRevenuePercentage	1.00
CY2010	btu	Segment Reporting Revenue Percentage SegmentReportingRevenuePercentage	1.00
CY2009	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue	23100000	USD
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
CY2011	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodFairValue	50000000	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
CY2009	btu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodFairValue	11200000	USD
CY2009	btu	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageFairValue	26.84	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
CY2010	btu	Share Based Compensation Expense Net Of Tax ShareBasedCompensationExpenseNetOfTax	25700000	USD
CY2011	btu	Share Based Compensation Expense Net Of Tax ShareBasedCompensationExpenseNetOfTax	27600000	USD
CY2009	btu	Share Based Compensation Expense Net Of Tax ShareBasedCompensationExpenseNetOfTax	23800000	USD
CY2010	btu	Shares Relinquished SharesRelinquished	13500000	USD
CY2011	btu	Shares Relinquished SharesRelinquished	18700000	USD
CY2009	btu	Shares Relinquished SharesRelinquished	2300000	USD
CY2010	btu	Shares Relinquished Shares SharesRelinquishedShares	300000	shares
CY2011	btu	Shares Relinquished Shares SharesRelinquishedShares	300000	shares
CY2009	btu	Shares Relinquished Shares SharesRelinquishedShares	100000	shares
CY2011Q4	btu	Surety Bonds Outstanding For Reclamation SuretyBondsOutstandingForReclamation	791600000	USD
CY2010Q4	btu	Surety Bonds Outstanding For Reclamation SuretyBondsOutstandingForReclamation	704400000	USD
CY2011	btu	Take Or Pay Commitments Due Within Next Four Years TakeOrPayCommitmentsDueWithinNextFourYears	1644000000	USD
CY2011	btu	Take Or Pay Commitments Due Within Next Year TakeOrPayCommitmentsDueWithinNextYear	443100000	USD
CY2011	btu	Tax Benefits Recognized From Uncertain Tax Positions Measurement TaxBenefitsRecognizedFromUncertainTaxPositionsMeasurement	greater than fifty percent likelihood of being realized upon ultimate settlement
CY2011	btu	Term Loan Facility Percentage Of Periodic Repayment TermLoanFacilityPercentageOfPeriodicRepayment	0.0125
CY2011	btu	Time Period Of Lease That Permits Partnership To Purchase Terminal TimePeriodOfLeaseThatPermitsPartnershipToPurchaseTerminal	P30Y
CY2011Q4	btu	Total Shares Of Common Stock Available For Grant TotalSharesOfCommonStockAvailableForGrant	14000000	shares
CY2011	btu	Total Take Or Pay Commitments TotalTakeOrPayCommitments	4547600000	USD
CY2011	btu	Transactions With Affiliates Net TransactionsWithAffiliatesNet	0	USD
CY2010	btu	Transactions With Affiliates Net TransactionsWithAffiliatesNet	0	USD
CY2009	btu	Transactions With Affiliates Net TransactionsWithAffiliatesNet	0	USD
CY2011Q4	btu	Unamortized Debt Issuance Expense Which Will Be Amortized To Interest Expense Over Next Five Years UnamortizedDebtIssuanceExpenseWhichWillBeAmortizedToInterestExpenseOverNextFiveYears	69200000	USD
CY2011Q4	btu	Undivided Interest Percent Of New Electricity Generation Project UndividedInterestPercentOfNewElectricityGenerationProject	0.0506
CY2010Q4	btu	Unrecognized Tax Benefits Net UnrecognizedTaxBenefitsNet	107900000	USD
CY2011Q4	btu	Unrecognized Tax Benefits Net UnrecognizedTaxBenefitsNet	114700000	USD
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2011
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Document Type DocumentType	10-K
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0001064728
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	272259729	shares
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	8300
CY2011Q2	dei	Entity Public Float EntityPublicFloat	15900000000	USD
CY2011	dei	Entity Registrant Name EntityRegistrantName	PEABODY ENERGY CORP
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0001064728-12-000020-index-headers.html	Edgar Link	pending
0001064728-12-000020-index.html	Edgar Link	pending
0001064728-12-000020.txt	Edgar Link	pending
0001064728-12-000020-xbrl.zip	Edgar Link	pending
ausmap.jpg	Edgar Link	pending
btu-20111231.xml	Edgar Link	completed
btu-20111231.xsd	Edgar Link	pending
btu-20111231x10k.htm	Edgar Link	pending
btu-20111231_cal.xml	Edgar Link	unprocessable
btu-20111231_def.xml	Edgar Link	unprocessable
btu-20111231_lab.xml	Edgar Link	unprocessable
btu-20111231_pre.xml	Edgar Link	unprocessable
btu_20111231xex10101.htm	Edgar Link	pending
btu_20111231xex102.htm	Edgar Link	pending
btu_20111231xex1059.htm	Edgar Link	pending
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btu_20111231xex95.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
peabodya01.gif	Edgar Link	pending
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report.css	Edgar Link	pending
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usmap.jpg	Edgar Link	pending

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$BTU
PEABODY ENERGY CORP Stock $btu

2010 Q4 Form 10-K Financial Statement

#000106472812000020 Filed on February 27, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BTU PEABODY ENERGY CORP Stock $btu

2010 Q4 Form 10-K Financial Statement

#000106472812000020 Filed on February 27, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BTU
PEABODY ENERGY CORP Stock $btu