$DTE
DTE ENERGY CO Stock $dte

$dte Overview Financials Valuation SEC Filings Company Website

2010 Q4 Form 10-K Financial Statement

#000093634012000004 Filed on February 16, 2012

Income Statement

Concept	2010 Q4	2010 Q3	2010 Q2
Revenue	$2.173B	$2.139B	$1.792B
YoY Change	2.45%	9.69%	6.16%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$252.0M	$271.0M	$253.0M
YoY Change	-10.64%	1.88%	5.42%
% of Gross Profit
Operating Expenses	$1.833B	$1.752B	$1.538B
YoY Change	0.11%	8.28%	4.41%
Operating Profit	$350.0M	$386.0M	$256.0M
YoY Change
Interest Expense	-$128.0M	$142.0M	-$133.0M
YoY Change	-4.48%	-207.58%	1.53%
% of Operating Profit	-36.57%	36.79%	-51.95%
Other Income/Expense, Net	-$7.000M	-$128.0M	$8.000M
YoY Change	-450.0%	-740.0%	-70.37%
Pretax Income	$215.0M	$258.0M	$131.0M
YoY Change	22.86%	17.27%	18.02%
Income Tax	$59.00M	$92.00M	$44.00M
% Of Pretax Income	27.44%	35.66%	33.59%
Net Earnings	$152.0M	$163.0M	$86.00M
YoY Change	26.67%	7.95%	3.61%
Net Earnings / Revenue	6.99%	7.62%	4.8%
Basic Earnings Per Share	$0.90	$0.97	$0.51
Diluted Earnings Per Share	$0.90	$0.96	$0.51
COMMON SHARES
Basic Shares Outstanding		169.0M shares
Diluted Shares Outstanding		170.0M shares

Balance Sheet

Concept	2010 Q4	2010 Q3	2010 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$65.00M	$84.00M	$124.0M
YoY Change	25.0%	1.2%	195.24%
Cash & Equivalents	$65.00M	$84.00M	$124.0M
Short-Term Investments
Other Short-Term Assets	$197.0M	$688.0M	$578.0M
YoY Change	-70.2%	-10.53%	-23.24%
Inventory	$662.0M	$732.0M	$565.0M
Prepaid Expenses
Receivables	$1.351B	$1.140B	$1.219B
Other Receivables	$402.0M	$97.00M	$95.00M
Total Short-Term Assets	$3.167B	$2.741B	$2.581B
YoY Change	10.08%	3.28%	1.81%
LONG-TERM ASSETS
Property, Plant & Equipment	$12.99B	$12.82B	$12.77B
YoY Change	4.51%	3.44%	3.05%
Goodwill	$2.020B
YoY Change	-0.2%
Intangibles	$67.00M
YoY Change
Long-Term Investments	$1.534B	$1.465B	$1.360B
YoY Change	0.2%	-7.51%	-8.17%
Other Assets	$206.0M	$5.026B	$5.112B
YoY Change	-96.01%	-1.8%	-3.07%
Total Long-Term Assets	$7.280B	$21.53B	$21.45B
YoY Change	-65.85%	1.03%	0.43%
TOTAL ASSETS
Total Short-Term Assets	$3.167B	$2.741B	$2.581B
Total Long-Term Assets	$7.280B	$21.53B	$21.45B
Total Assets	$24.90B	$24.27B	$24.03B
YoY Change	2.9%	1.28%	0.58%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$729.0M	$641.0M	$684.0M
YoY Change	0.83%	10.9%	11.95%
Accrued Expenses	$111.0M	$135.0M	$114.0M
YoY Change	-2.63%	-9.4%	-2.56%
Deferred Revenue
YoY Change
Short-Term Debt	$150.0M	$20.00M	$0.00
YoY Change	-54.13%	-90.24%	-100.0%
Long-Term Debt Due	-$765.0M	$923.0M	$1.335B
YoY Change	46.83%	442.94%	699.4%
Total Short-Term Liabilities	$2.749B	$2.513B	$2.931B
YoY Change	3.93%	27.18%	41.18%
LONG-TERM LIABILITIES
Long-Term Debt	$6.114B	$7.074B	$6.633B
YoY Change	-1.97%	-10.16%	-16.49%
Other Long-Term Liabilities	$358.0M	$5.683B	$5.660B
YoY Change	-93.79%	-1.1%	-0.21%
Total Long-Term Liabilities	$8.291B	$12.76B	$12.29B
YoY Change	32.93%	-6.34%	-9.71%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.749B	$2.513B	$2.931B
Total Long-Term Liabilities	$8.291B	$12.76B	$12.29B
Total Liabilities	$11.04B	$17.62B	$17.48B
YoY Change	-38.38%	-0.58%	-1.57%
SHAREHOLDERS EQUITY
Retained Earnings	$3.431B
YoY Change
Common Stock	$3.440B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.722B	$6.646B	$6.557B
YoY Change
Total Liabilities & Shareholders Equity	$24.90B	$24.27B	$24.03B
YoY Change	2.9%	1.28%	0.58%

Cashflow Statement

Concept	2010 Q4	2010 Q3	2010 Q2
OPERATING ACTIVITIES
Net Income	$152.0M	$163.0M	$86.00M
YoY Change	26.67%	7.95%	3.61%
Depreciation, Depletion And Amortization	$252.0M	$271.0M	$253.0M
YoY Change	-10.64%	1.88%	5.42%
Cash From Operating Activities	$316.0M	$358.0M	$334.0M
YoY Change	117.93%	-4.02%	-27.86%
INVESTING ACTIVITIES
Capital Expenditures	-$281.0M	-$303.0M	-$276.0M
YoY Change	30.09%	47.09%	-3.83%
Acquisitions
YoY Change
Other Investing Activities	-$111.0M	-$39.00M	-$45.00M
YoY Change	109.43%	-285.71%	-32.84%
Cash From Investing Activities	-$392.0M	-$342.0M	-$321.0M
YoY Change	45.72%	84.86%	-9.32%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	57.00M	-56.00M	-82.00M
YoY Change	-38.71%	-61.9%	-46.75%
NET CHANGE
Cash From Operating Activities	316.0M	358.0M	334.0M
Cash From Investing Activities	-392.0M	-342.0M	-321.0M
Cash From Financing Activities	57.00M	-56.00M	-82.00M
Net Change In Cash	-19.00M	-40.00M	-69.00M
YoY Change	-38.71%	-197.56%	53.33%
FREE CASH FLOW
Cash From Operating Activities	$316.0M	$358.0M	$334.0M
Capital Expenditures	-$281.0M	-$303.0M	-$276.0M
Free Cash Flow	$597.0M	$661.0M	$610.0M
YoY Change	65.37%	14.16%	-18.67%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	729000000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	782000000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1351000000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1317000000	USD
CY2010Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	75000000	USD
CY2011Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	65000000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8582000000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8795000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-30000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-30000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-4000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-4000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-116000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-125000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	1000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	1000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-149000000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-158000000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	52000000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	66000000	USD
CY2009	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	56000000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	196000000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	162000000	USD
CY2009Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	262000000	USD
CY2008Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	265000000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5000000	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2009	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2009	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4000000	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5000000	shares
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10000000	USD
CY2009	us-gaap	Asset Impairment Charges AssetImpairmentCharges	6000000	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1000000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1514000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1593000000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	93000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	-2000000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	10000000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-23000000	USD
	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	20000000	USD
CY2011Q1	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	19000000	USD
CY2010	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	22000000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-1000000	USD
CY2010Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	1498000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	1591000000	USD
CY2011Q4	us-gaap	Assets Assets	26009000000	USD
CY2010Q4	us-gaap	Assets Assets	24896000000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	3167000000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	3196000000	USD
CY2011Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	7605000000	USD
CY2010Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	7280000000	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	37000000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	46000000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	192000000	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	-38000000	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	-55000000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	-83000000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	102000000	USD
CY2010Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	88000000	USD
CY2011Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	7000000	USD
CY2011Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	23000000	USD
CY2010Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	43000000	USD
CY2010Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	153000000	USD
CY2011Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	57000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	35000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	9000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	3000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	7000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	9000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	7000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	0	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	5000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	30000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Receivable CapitalLeasesFutureMinimumPaymentsReceivable	103000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Receivable Current CapitalLeasesFutureMinimumPaymentsReceivableCurrent	12000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Receivable Due Thereafter CapitalLeasesFutureMinimumPaymentsReceivableDueThereafter	43000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Receivable In Five Years CapitalLeasesFutureMinimumPaymentsReceivableInFiveYears	12000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Receivable In Four Years CapitalLeasesFutureMinimumPaymentsReceivableInFourYears	12000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Receivable In Three Years CapitalLeasesFutureMinimumPaymentsReceivableInThreeYears	12000000	USD
CY2011Q4	us-gaap	Capital Leases Future Minimum Payments Receivable In Two Years CapitalLeasesFutureMinimumPaymentsReceivableInTwoYears	12000000	USD
CY2011Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	34000000	USD
CY2010Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	114000000	USD
CY2011Q4	us-gaap	Capital Leases Lessor Balance Sheet Net Investment In Direct Financing Leases Current CapitalLeasesLessorBalanceSheetNetInvestmentInDirectFinancingLeasesCurrent	-4000000	USD
CY2011Q4	us-gaap	Capital Leases Lessor Balance Sheet Net Investment In Direct Financing Leases Noncurrent CapitalLeasesLessorBalanceSheetNetInvestmentInDirectFinancingLeasesNoncurrent	83000000	USD
CY2011Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases CapitalLeasesNetInvestmentInDirectFinancingLeases	87000000	USD
CY2011Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Deferred Income CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome	-56000000	USD
CY2011Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Unguaranteed Residual Values Of Leased Property CapitalLeasesNetInvestmentInDirectFinancingLeasesUnguaranteedResidualValuesOfLeasedProperty	40000000	USD
CY2011Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	300000000	USD
CY2010Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	252000000	USD
CY2011	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	65000000	USD
CY2009	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	66000000	USD
CY2010	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	65000000	USD
CY2011Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	623000000	USD
CY2010Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	602000000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	68000000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	65000000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	52000000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	86000000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	13000000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	3000000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-34000000	USD
CY2011Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	71000000	USD
CY2010Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	77000000	USD
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.18
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.12
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.32
CY2011Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.00
CY2010Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.00
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2010Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	169428406	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	169247282	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	169247282	shares
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	169428406	shares
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	3417000000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	3440000000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	628000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	702000000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	550000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	9000000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3000000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	9000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	711000000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	553000000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	637000000	USD
CY2009	us-gaap	Cost Of Goods And Services Energy Commodities And Services CostOfGoodsAndServicesEnergyCommoditiesAndServices	3118000000	USD
CY2010	us-gaap	Cost Of Goods And Services Energy Commodities And Services CostOfGoodsAndServicesEnergyCommoditiesAndServices	3190000000	USD
CY2011	us-gaap	Cost Of Goods And Services Energy Commodities And Services CostOfGoodsAndServicesEnergyCommoditiesAndServices	3537000000	USD
CY2010	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	1027000000	USD
CY2009	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	1020000000	USD
CY2011	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	995000000	USD
CY2009	us-gaap	Costs And Expenses CostsAndExpenses	6765000000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	7093000000	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	7474000000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-172000000	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	25000000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	25000000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-146000000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	47000000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	42000000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	22000000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	26000000	USD
CY2009	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	17000000	USD
CY2011Q4	us-gaap	Debt Current DebtCurrent	-355000000	USD
CY2010Q4	us-gaap	Debt Current DebtCurrent	-765000000	USD
CY2011Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1308000000	USD
CY2011Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	8800000000	USD
CY2010Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	8500000000	USD
CY2010Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	939000000	USD
CY2011Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	937000000	USD
CY2011Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	148000000	USD
CY2010Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	149000000	USD
CY2010Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	939000000	USD
CY2011Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	937000000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	318000000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	415000000	USD
CY2009	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	182000000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	220000000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	457000000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	205000000	USD
CY2009	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	205000000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	457000000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	220000000	USD
CY2009	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	23000000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	42000000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-98000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-3065000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-2493000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1418000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1048000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	139000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	51000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-2000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-45000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	83000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	99000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	294000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	337000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	-39000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	-36000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	-27000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	-32000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	-4113000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	-3911000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2632000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3116000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	-3131000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	-2558000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	-396000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	-360000000	USD
CY2010Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	866000000	USD
CY2011Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	1298000000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation	297000000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents	23000000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	306000000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	35000000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Estimated Future Employer Contributions In Current Fiscal Year DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear	120000000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	35000000	USD
CY2009	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	33000000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	34000000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1027000000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1020000000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	995000000	USD
CY2010Q4	us-gaap	Derivative Assets DerivativeAssets	1258000000	USD
CY2011Q4	us-gaap	Derivative Assets DerivativeAssets	1344000000	USD
CY2010Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	131000000	USD
CY2011Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	222000000	USD
CY2010Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	1006000000	USD
CY2011Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	1097000000	USD
CY2010Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	77000000	USD
CY2011Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	74000000	USD
CY2010Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2848000000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2805000000	USD
CY2010Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	-2936000000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	-2811000000	USD
CY2010	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	123000000	USD
CY2011	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	159000000	USD
CY2010Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	-252000000	USD
CY2011Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	-247000000	USD
CY2010Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	142000000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	158000000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	89000000	USD
CY2010Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	110000000	USD
CY2010	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	5000000	USD
CY2011	us-gaap	Distributed Earnings DistributedEarnings	393000000	USD
CY2010	us-gaap	Distributed Earnings DistributedEarnings	367000000	USD
CY2009	us-gaap	Distributed Earnings DistributedEarnings	349000000	USD
CY2010	us-gaap	Dividends Cash DividendsCash	2000000	USD
CY2011	us-gaap	Dividends Cash DividendsCash	1000000	USD
CY2009	us-gaap	Dividends Cash DividendsCash	2000000	USD
CY2010Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	95000000	USD
CY2011Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	99000000	USD
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.24
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.19
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.75
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.19
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.08
CY2010Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2010Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.38
CY2010Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
CY2010	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	2.18
CY2009	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	2.12
CY2011	us-gaap	Earnings Per Share Basic Distributed EarningsPerShareBasicDistributed	2.32
CY2010	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	1.57
CY2009	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	1.12
CY2011	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	1.87
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.18
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.74
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.24
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.04
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.88
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.19
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.07
CY2010Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.38
CY2010Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.90
CY2010Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.96
CY2010	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	2.18
CY2009	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	2.12
CY2011	us-gaap	Earnings Per Share Diluted Distributed EarningsPerShareDilutedDistributed	2.32
CY2009	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.316	percent
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.271	percent
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.327	percent
CY2009	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3000000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	4000000	USD
CY2011Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	50000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition	1.36	years
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	20000000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	22000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	25000000	USD
CY2010Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	147000000	USD
CY2011Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	95000000	USD
CY2011Q4	us-gaap	Extinguishment Of Debt Amount ExtinguishmentOfDebtAmount	1280000000	USD
CY2011	us-gaap	Fair Value Level1 To Level2 Transfers Amount FairValueLevel1ToLevel2TransfersAmount	0	USD
CY2010	us-gaap	Fair Value Level1 To Level2 Transfers Amount FairValueLevel1ToLevel2TransfersAmount	0	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings	69000000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings	87000000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	6000000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease	-9000000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease	75000000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	3000000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	-87000000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-87000000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	4000000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	9000000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	47000000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	35000000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	-24000000	USD
CY2009Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	24000000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	59000000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	44000000	USD
CY2010Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	22000000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	28000000	USD
CY2011	us-gaap	Finite Lived Intangible Assets Future Amortization Expense FiniteLivedIntangibleAssetsFutureAmortizationExpense	3000000	USD
CY2010Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	89000000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	101000000	USD
CY2011	us-gaap	Finite Lived Intangible Assets Useful Life Maximum FiniteLivedIntangibleAssetsUsefulLifeMaximum	20	percent
CY2011	us-gaap	Finite Lived Intangible Assets Useful Life Minimum FiniteLivedIntangibleAssetsUsefulLifeMinimum	3	years
CY2011Q4	us-gaap	Goodwill Goodwill	2020000000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	2020000000	USD
CY2009Q4	us-gaap	Goodwill Goodwill	2024000000	USD
CY2010	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	-4000000	USD
CY2011	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2010	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	4000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	950000000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	782000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	987000000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	311000000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	267000000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	247000000	USD
CY2011Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87000000	USD
CY2011	us-gaap	Income Tax Expense Benefit Intraperiod Tax Allocation IncomeTaxExpenseBenefitIntraperiodTaxAllocation	267000000	USD
CY2010	us-gaap	Income Tax Expense Benefit Intraperiod Tax Allocation IncomeTaxExpenseBenefitIntraperiodTaxAllocation	311000000	USD
CY2009	us-gaap	Income Tax Expense Benefit Intraperiod Tax Allocation IncomeTaxExpenseBenefitIntraperiodTaxAllocation	247000000	USD
CY2011	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	-4000000	USD
CY2010	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	-5000000	USD
CY2009	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	-5000000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	0	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	0	USD
CY2009	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-6000000	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	-7000000	USD
CY2009	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	-5000000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	-7000000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	274000000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	345000000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	333000000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4000000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4000000	USD
CY2009	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4000000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-6000000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1000000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1000000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	25000000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	37000000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	44000000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	-6000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	-6000000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	-7000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	-6000000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	-33000000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	-12000000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Settlements Domestic IncomeTaxReconciliationTaxSettlementsDomestic	-12000000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-129000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Settlements Domestic IncomeTaxReconciliationTaxSettlementsDomestic	0	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Settlements Domestic IncomeTaxReconciliationTaxSettlementsDomestic	-11000000	USD
CY2009	us-gaap	Income Taxes Paid IncomeTaxesPaid	18000000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	-205000000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	93000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-12000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	23000000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	162000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	71000000	USD
CY2009	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	167000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	79000000	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-249000000	USD
CY2009	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-43000000	USD
CY2010	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	245000000	USD
CY2011	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	-94000000	USD
CY2010	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	-48000000	USD
CY2009	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	-81000000	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	28000000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-133000000	USD
CY2011	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	94000000	USD
CY2009	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	69000000	USD
CY2010	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-293000000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	9000000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	58000000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-52000000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	293000000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-94000000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-69000000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-171000000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-83000000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	10000000	USD
CY2009	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	147000000	USD
CY2011	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	-209000000	USD
CY2010	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	24000000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Pension Costs IncreaseDecreaseInPrepaidPensionCosts	67000000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Pension Costs IncreaseDecreaseInPrepaidPensionCosts	432000000	USD
CY2009	us-gaap	Increase Decrease In Prepaid Pension Costs IncreaseDecreaseInPrepaidPensionCosts	11000000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	32000000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	5000000	USD
CY2009	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-2000000	USD
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2009	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	73000000	USD
CY2011Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	1484000000	USD
CY2009	us-gaap	Investment Income Interest InvestmentIncomeInterest	19000000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	10000000	USD
CY2010Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	67000000	USD
CY2009	us-gaap	Interest Expense InterestExpense	545000000	USD
CY2010	us-gaap	Interest Expense InterestExpense	549000000	USD
CY2011	us-gaap	Interest Expense InterestExpense	494000000	USD
CY2010	us-gaap	Interest Paid InterestPaid	551000000	USD
CY2009	us-gaap	Interest Paid InterestPaid	550000000	USD
CY2011	us-gaap	Interest Paid InterestPaid	485000000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	95000000	USD
CY2010Q4	us-gaap	Interest Payable Current InterestPayableCurrent	111000000	USD
CY2011Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	1000000	USD
CY2011Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	572000000	USD
CY2010Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	460000000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	12000000	USD
CY2010Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	111000000	USD
CY2011Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	111000000	USD
CY2011Q4	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	280000000	USD
CY2010Q4	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	0	USD
CY2010Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	43000000	USD
CY2011Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	52000000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	71000000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	58000000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	54000000	USD
CY2011Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	39000000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	24896000000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	26009000000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2628000000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2749000000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	9141000000	USD
CY2010Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	8291000000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	-637000000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	2015000000	USD
CY2011	us-gaap	Line Of Credit Facility Dividend Restrictions LineOfCreditFacilityDividendRestrictions	128
CY2010	us-gaap	Line Of Credit Facility Dividend Restrictions LineOfCreditFacilityDividendRestrictions	46
CY2011	us-gaap	Line Of Credit Facility Increase Additional Borrowings LineOfCreditFacilityIncreaseAdditionalBorrowings	15000000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1378000000	USD
CY2011Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	-218000000	USD
CY2011Q4	us-gaap	Long Term Commercial Paper Current LongTermCommercialPaperCurrent	-419000000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	7700000000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	8000000000	USD
CY2010Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	7089000000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	7187000000	USD
CY2010Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	925000000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	526000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	4530000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	519000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	465000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	476000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	892000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	811000000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	6405000000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	6114000000	USD
CY2011Q4	us-gaap	Long Term Investments LongTermInvestments	1462000000	USD
CY2010Q4	us-gaap	Long Term Investments LongTermInvestments	1457000000	USD
CY2011	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	5300000000	USD
CY2011Q4	us-gaap	Long Term Transition Bond LongTermTransitionBond	479000000	USD
CY2010Q4	us-gaap	Long Term Transition Bond LongTermTransitionBond	643000000	USD
CY2010Q4	us-gaap	Longterm Transition Bond Current LongtermTransitionBondCurrent	-150000000	USD
CY2011Q4	us-gaap	Longterm Transition Bond Current LongtermTransitionBondCurrent	-164000000	USD
CY2011Q4	us-gaap	Longterm Transition Bond Current And Noncurrent LongtermTransitionBondCurrentAndNoncurrent	643000000	USD
CY2010Q4	us-gaap	Longterm Transition Bond Current And Noncurrent LongtermTransitionBondCurrentAndNoncurrent	793000000	USD
CY2011Q4	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	400000000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	44000000	USD
CY2010Q4	us-gaap	Minority Interest MinorityInterest	45000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-445000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-789000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-586000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1226000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1064000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1560000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1819000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2008000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1825000000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	532000000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	711000000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	630000000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	150000000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	176000000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	183000000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	202000000	USD
CY2010Q4	us-gaap	Net Income Loss NetIncomeLoss	152000000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	163000000	USD
CY2010Q1	us-gaap	Net Income Loss NetIncomeLoss	229000000	USD
CY2010Q2	us-gaap	Net Income Loss NetIncomeLoss	86000000	USD
CY2009	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3000000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9000000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9000000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-436000000	USD
CY2009	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-467000000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-514000000	USD
CY2011Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	123000000	USD
CY2010Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	123000000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	1423000000	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	1249000000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	1464000000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	346000000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	390000000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	288000000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	399000000	USD
CY2010Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	472000000	USD
CY2010Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	350000000	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	386000000	USD
CY2010Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	256000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	195000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	37000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	18000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	20000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	24000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	29000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	67000000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	196000000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	197000000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	199000000	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	206000000	USD
CY2010	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-20000000	USD
CY2011	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	8000000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	7000000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	15000000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-9000000	USD
CY2010	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	3000000	USD
CY2009	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	4000000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax OtherComprehensiveIncomeDefinedBenefitPlansTax	-5000000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	2000000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	1000000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	0	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	1000000	USD
CY2009	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	2000000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	0	USD
CY2009	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax	1000000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-9000000	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	3000000	USD
CY2011	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 Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	2000000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-2000000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	1000000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	1000000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	-1000000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	3000000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1000000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	2000000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1000000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-10000000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	5000000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	0	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3000000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-6000000	USD
CY2009	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	-20000000	USD
CY2010	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	-10000000	USD
CY2011	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1000000	USD
CY2011	us-gaap	Other Income OtherIncome	117000000	USD
CY2010	us-gaap	Other Income OtherIncome	78000000	USD
CY2009	us-gaap	Other Income OtherIncome	102000000	USD
CY2010Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	63000000	USD
CY2011Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	65000000	USD
CY2011Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	219000000	USD
CY2010Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	202000000	USD
CY2010Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	597000000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	549000000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	358000000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	331000000	USD
CY2010Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	289000000	USD
CY2011Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	0	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	525000000	USD
CY2010Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	518000000	USD
CY2010Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	1275000000	USD
CY2009	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	43000000	USD
CY2011	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	69000000	USD
CY2010	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	55000000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	389000000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	97000000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	410000000	USD
CY2009	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	315000000	USD
CY2009	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	15000000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	3000000	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	49000000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	360000000	USD
CY2010Q4	us-gaap	Other Receivables OtherReceivables	402000000	USD
CY2011Q4	us-gaap	Other Receivables OtherReceivables	90000000	USD
CY2011Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	56000000	USD
CY2010Q4	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	39000000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
CY2009	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
CY2010	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	0	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	88000000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	69000000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	79000000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	18000000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2009	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	348000000	USD
CY2009Q4	us-gaap	Prescription Drug Benefit Effect Of Subsidy On Net Periodic Postretirement Benefit Cost PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost	20000000	USD
CY2011Q4	us-gaap	Prescription Drug Benefit Effect Of Subsidy On Net Periodic Postretirement Benefit Cost PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost	6000000	USD
CY2010Q4	us-gaap	Prescription Drug Benefit Effect Of Subsidy On Net Periodic Postretirement Benefit Cost PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost	7000000	USD
CY2011Q4	us-gaap	Prescription Drug Subsidy Receipts Year One PrescriptionDrugSubsidyReceiptsYearOne	6000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2009	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	35000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	36000000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	427000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1179000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	614000000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-31000000	USD
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-36000000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	269000000	USD
CY2009	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-417000000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-177000000	USD
CY2009	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	295000000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	377000000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	80000000	USD
CY2011	us-gaap	Proceeds From Sale Of Other Productive Assets ProceedsFromSaleOfOtherProductiveAssets	18000000	USD
CY2009	us-gaap	Proceeds From Sale Of Other Productive Assets ProceedsFromSaleOfOtherProductiveAssets	83000000	USD
CY2010	us-gaap	Proceeds From Sale Of Other Productive Assets ProceedsFromSaleOfOtherProductiveAssets	56000000	USD
CY2010	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	23000000	USD
CY2009	us-gaap	Profit Loss ProfitLoss	535000000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	639000000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	720000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	13746000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	22541000000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12992000000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	21574000000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1660000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1884000000	USD
CY2011	us-gaap	Property Plant And Equipment Useful Life Maximum PropertyPlantAndEquipmentUsefulLifeMaximum	55	years
CY2011	us-gaap	Property Plant And Equipment Useful Life Minimum PropertyPlantAndEquipmentUsefulLifeMinimum	3	years
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	10000000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	10000000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	902000000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	991000000	USD
CY2010Q4	us-gaap	Regulatory Assets RegulatoryAssets	4158000000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	4853000000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	314000000	USD
CY2010Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	100000000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	4539000000	USD
CY2010Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	4058000000	USD
CY2010Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1422000000	USD
CY2011Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1073000000	USD
CY2010Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	-94000000	USD
CY2011Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	-54000000	USD
CY2010Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1328000000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1019000000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1455000000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	486000000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	663000000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	147000000	USD
CY2010Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	120000000	USD
CY2010	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	219000000	USD
CY2011	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	301000000	USD
CY2009	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	65000000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3750000000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3431000000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	4.41
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	29000000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4827457	shares
CY2011Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	577000000	USD
CY2010Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	729000000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod	3
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	-71946	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	621114	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	47.98
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0498	percent
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0508	percent
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	6	years
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	6	years
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.2296	percent
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.2788	percent
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0204	percent
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0291	percent
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	9000000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2098184	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	42.42
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	4.25	years
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3000000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	20000000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	9000000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	40.83
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	-22558	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	43.44
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	5.62
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-2000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	1000000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2764670	shares
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-2000000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6767000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	5000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4000000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.25
CY2009	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	2372000000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	2578000000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.09
CY2010	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	308000000	USD
CY2011	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	313000000	USD
CY2009	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	275000000	USD
CY2011Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	2764670	shares
CY2011Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	19000000	USD
CY2010	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	7000000	USD
CY2009	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	8000000	USD
CY2011Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	41.25
CY2011Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm1	5.10	years
CY2011	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	3000000	USD
CY2011Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	597000000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	2628000000	USD
CY2010	us-gaap	Utility Revenue UtilityRevenue	8557000000	USD
CY2010Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.004	percent
CY2010Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	575000000	USD
CY2011Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	31000000	USD
CY2010	us-gaap	Stock Issued1 StockIssued1	156000000	USD
CY2011	us-gaap	Stock Issued1 StockIssued1	1000000	USD
CY2009	us-gaap	Stock Issued1 StockIssued1	47000000	USD
CY2011	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	1.86	USD
CY2010	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	1.56	USD
CY2009	us-gaap	Utility Revenue UtilityRevenue	8014000000	USD
CY2010	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	4000000	USD
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	419000000	USD
CY2010Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	150000000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	687061	shares
CY2009	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	3000000	USD
CY2011	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	2000000	USD
CY2011Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.005	percent
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	7009000000	USD
CY2009	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	1.12	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	6722000000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7053000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	53000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2011	us-gaap	Utility Revenue UtilityRevenue	8897000000	USD
CY2011Q4	us-gaap	Utility Revenue UtilityRevenue	2173000000	USD
CY2011Q2	us-gaap	Utility Revenue UtilityRevenue	2028000000	USD
CY2011Q3	us-gaap	Utility Revenue UtilityRevenue	2265000000	USD
CY2011Q1	us-gaap	Utility Revenue UtilityRevenue	2431000000	USD
CY2010Q1	us-gaap	Utility Revenue UtilityRevenue	2453000000	USD
CY2010Q2	us-gaap	Utility Revenue UtilityRevenue	1792000000	USD
CY2010Q3	us-gaap	Utility Revenue UtilityRevenue	2139000000	USD
CY2010Q4	us-gaap	Utility Revenue UtilityRevenue	2173000000	USD
CY2010Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	32000000	USD
CY2011Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	27000000	USD
CY2011	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	21000000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	5000000	USD
CY2009	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	10000000	USD
CY2009	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	155000000	USD
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	94000000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	113000000	USD
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	169000000	shares
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	18000000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	20000000	USD
CY2009	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	17000000	USD
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	168000000	shares
CY2011	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	-146000000	USD
CY2009	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	-175000000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	-199000000	USD
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	169000000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	164000000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	170000000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164000000	shares
CY2011Q4	dte	Cash Collateral Paid Or Received For Derivative Assets CashCollateralPaidOrReceivedForDerivativeAssets	19000000	USD
CY2010Q4	dte	Cash Collateral Paid Or Received For Derivative Assets CashCollateralPaidOrReceivedForDerivativeAssets	9000000	USD
CY2010	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	1000000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	1000000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	1000000	shares
	dte	Additional Revenue For Renewable Energy Plan AdditionalRevenueForRenewableEnergyPlan	100000000	USD
CY2010Q2	dte	After Tax Amount Of Cost To Achieve Previously Expensed Deferred And Recognized In Income AfterTaxAmountOfCostToAchievePreviouslyExpensedDeferredAndRecognizedInIncome	20000000	USD
CY2011	dte	Aggregate Limit Of Liabilities Arises From Terroist Act Outside Scope Of Trials Subject To One Industry AggregateLimitOfLiabilitiesArisesFromTerroistActOutsideScopeOfTrialsSubjectToOneIndustry	300000000	USD
CY2011	dte	Amortization Period Of Cost To Achieve Deferral AmortizationPeriodOfCostToAchieveDeferral	10	years
CY2011	dte	Amortization Period Of Cta AmortizationPeriodOfCta	10	years
	dte	Amount Of Credit To Cim Regulatory Asset AmountOfCreditToCimRegulatoryAsset	37000000	USD
CY2011	dte	Amount Per Event Loss Associated With Nuclear Power Plants AmountPerEventLossAssociatedWithNuclearPowerPlants	29000000	USD
CY2010	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntities	10000000	USD
CY2009	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntities	0	USD
CY2011	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntities	0	USD
CY2010	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities1 AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntities1	-10000000	USD
CY2011	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities1 AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntities1	0	USD
CY2009	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities1 AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntities1	0	USD
CY2010	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities Tax AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntitiesTax	5000000	USD
CY2009	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities Tax AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntitiesTax	0	USD
CY2011	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities Tax AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntitiesTax	0	USD
CY2010	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities Tax1 AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntitiesTax1	-5000000	USD
CY2011	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities Tax1 AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntitiesTax1	0	USD
CY2009	dte	Amounts Reclassified To Benefit Obligations Related To Consolidation Of Variable Interest Entities Tax1 AmountsReclassifiedToBenefitObligationsRelatedToConsolidationOfVariableInterestEntitiesTax1	0	USD
	dte	Annual Revenue Decoupling Mechanism Collar On Surcharge And Refund Year1 AnnualRevenueDecouplingMechanismCollarOnSurchargeAndRefundYear1	0.015	percent
	dte	Annual Revenue Decoupling Mechanism Collar On Surcharge And Refund Year2 And Subsequent Years AnnualRevenueDecouplingMechanismCollarOnSurchargeAndRefundYear2AndSubsequentYears	0.03	percent
CY2011	dte	Approved Recovery Of Electric Utility Choice Incentive Mechanism ApprovedRecoveryOfElectricUtilityChoiceIncentiveMechanism	105000000	USD
CY2011Q4	dte	Average Maturity Of Debt Securities AverageMaturityOfDebtSecurities	7	years
CY2010Q4	dte	Average Maturity Of Debt Securities AverageMaturityOfDebtSecurities	6	years
CY2011	dte	Benefit Obligations Net Of Tax BenefitObligationsNetOfTax	-9000000	USD
CY2010	dte	Benefit Obligations Net Of Tax BenefitObligationsNetOfTax	5000000	USD
CY2009	dte	Benefit Obligations Net Of Tax BenefitObligationsNetOfTax	7000000	USD
CY2011Q4	dte	Borrowing Capacity Under Financing Agreement With Its Clearing Agent BorrowingCapacityUnderFinancingAgreementWithItsClearingAgent	100000000	USD
CY2010Q4	dte	Cash Collateral Paid Or Received For Derivative Liabilities CashCollateralPaidOrReceivedForDerivativeLiabilities	53000000	USD
CY2011Q4	dte	Cash Collateral Paid Or Received For Derivative Liabilities CashCollateralPaidOrReceivedForDerivativeLiabilities	74000000	USD
CY2011	dte	Capital Expenditures Over Next Few Years CapitalExpendituresOverNextFewYears	13000000	USD
CY2011	dte	Capitalized Computer Software Future Amortization Expense CapitalizedComputerSoftwareFutureAmortizationExpense	64000000	USD
CY2011Q4	dte	Cash Collateral Paid CashCollateralPaid	16000000	USD
CY2010Q4	dte	Cash Collateral Paid CashCollateralPaid	35000000	USD
CY2010Q4	dte	Cash Collateral Received CashCollateralReceived	2000000	USD
CY2011	dte	Combined Coverage Limit For Total Property Damage CombinedCoverageLimitForTotalPropertyDamage	2750000000	USD
CY2011	dte	Company Lowered Percentage Of Long Term Rate Of Return Assumption For Pension Plans CompanyLoweredPercentageOfLongTermRateOfReturnAssumptionForPensionPlans	0.0825	percent
CY2011	dte	Company Obligated To Pay Doe Fee Of Fermi2 Electricity Generated And Sold CompanyObligatedToPayDoeFeeOfFermi2ElectricityGeneratedAndSold	1	kWh
CY2011Q2	dte	Consistnet With Orginal Treatment Of Deferred Tax Liabilities No Cash Flow Impact ConsistnetWithOrginalTreatmentOfDeferredTaxLiabilitiesNoCashFlowImpact	0	USD
CY2011	dte	Consolidation Of Vies ConsolidationOfVies	0	USD
CY2010	dte	Consolidation Of Vies ConsolidationOfVies	19000000	USD
CY2009	dte	Consolidation Of Vies ConsolidationOfVies	0	USD
CY2010	dte	Contribution Of Common Stock To Pension Plan Value ContributionOfCommonStockToPensionPlanValue	100000000	USD
CY2011	dte	Coverage For Stabilization Decontamination Debris Removal Repair And Replacement Of Property And Decommissioning CoverageForStabilizationDecontaminationDebrisRemovalRepairAndReplacementOfPropertyAndDecommissioning	2250000000	USD
	dte	Current Composite Depreciation Rate CurrentCompositeDepreciationRate	0.0333	percent
CY2011Q4	dte	Debt Insrument On Variable Rate DebtInsrumentOnVariableRate	70
CY2011Q4	dte	Decommissioning Expenses Current DecommissioningExpensesCurrent	1400000000	USD
CY2011Q2	dte	Decrease In Deferred Tax Liabilities Attributaable To Regulated Utilities DecreaseInDeferredTaxLiabilitiesAttributaableToRegulatedUtilities	395000000	USD
CY2011	dte	Deferral Of Investigation And Remediation Of Costs Associated With Gas Utilities Former Mgp Sites DeferralOfInvestigationAndRemediationOfCostsAssociatedWithGasUtilitiesFormerMgpSites	10	years
CY2011Q4	dte	Deferred Interest Penalty Percentage DeferredInterestPenaltyPercentage	0.065	percent
CY2011	dte	Deferred Premium Charged Leviied Against Each Licensed Nuclear Facility DeferredPremiumChargedLeviiedAgainstEachLicensedNuclearFacility	117500000	USD
CY2011Q4	dte	Deferred Tax Assets Liabilities Derivative DeferredTaxAssetsLiabilitiesDerivative	64000000	USD
CY2010Q4	dte	Deferred Tax Assets Liabilities Derivative DeferredTaxAssetsLiabilitiesDerivative	29000000	USD
CY2010Q4	dte	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	-2461000000	USD
CY2011Q4	dte	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	-3038000000	USD
CY2011Q4	dte	Deferred Tax Assets Merger Basis Differences DeferredTaxAssetsMergerBasisDifferences	50000000	USD
CY2010Q4	dte	Deferred Tax Assets Merger Basis Differences DeferredTaxAssetsMergerBasisDifferences	49000000	USD
CY2011Q4	dte	Deferred Tax Assets State Net Operating Loss And Credit Carry Forwards DeferredTaxAssetsStateNetOperatingLossAndCreditCarryForwards	30000000	USD
CY2010Q4	dte	Deferred Tax Assets State Net Operating Loss And Credit Carry Forwards DeferredTaxAssetsStateNetOperatingLossAndCreditCarryForwards	33000000	USD
CY2010Q4	dte	Deferred Tax Assets State Net Operating Loss And Credit Carry Forwards1 DeferredTaxAssetsStateNetOperatingLossAndCreditCarryForwards1	33000000	USD
CY2011Q4	dte	Deferred Tax Assets State Net Operating Loss And Credit Carry Forwards1 DeferredTaxAssetsStateNetOperatingLossAndCreditCarryForwards1	30000000	USD
CY2010Q2	dte	Deferred Tax Liabilities Attributable To Regulated Utilities DeferredTaxLiabilitiesAttributableToRegulatedUtilities	36000000	USD
CY2011	dte	Disallowed Recovery Related Fo Pricing Of Certain Gas Purchases DisallowedRecoveryRelatedFoPricingOfCertainGasPurchases	3000000	USD
CY2011	dte	Dividends Declared Common Shares DividendsDeclaredCommonShares	392000000	USD
CY2009	dte	Dividends Declared Common Shares DividendsDeclaredCommonShares	347000000	USD
CY2010	dte	Dividends Declared Common Shares DividendsDeclaredCommonShares	365000000	USD
CY2011	dte	Enactment Of Michigan Corporate Income Tax Net Of Federal Expense EnactmentOfMichiganCorporateIncomeTaxNetOfFederalExpense	-87000000	USD
CY2009	dte	Enactment Of Michigan Corporate Income Tax Net Of Federal Expense EnactmentOfMichiganCorporateIncomeTaxNetOfFederalExpense	0	USD
CY2010	dte	Enactment Of Michigan Corporate Income Tax Net Of Federal Expense EnactmentOfMichiganCorporateIncomeTaxNetOfFederalExpense	0	USD
CY2011Q1	dte	Energy Optimization Overrecovery Electric Utility EnergyOptimizationOverrecoveryElectricUtility	21000000	USD
CY2011	dte	Environmental Capital Expenditures Through Current Year EnvironmentalCapitalExpendituresThroughCurrentYear	1700000000	USD
CY2010	dte	Eps Net Income Less Distributed Earnings EpsNetIncomeLessDistributedEarnings	263000000	USD
CY2011	dte	Environmental Capital Expenditures In Next Year EnvironmentalCapitalExpendituresInNextYear	255000000	USD
CY2011Q1	dte	Energy Optimization Overrecovery Gas Utility EnergyOptimizationOverrecoveryGasUtility	5600000	USD
CY2011Q4	dte	Environmental Capital Expenditures In Future Years EnvironmentalCapitalExpendituresInFutureYears	1900000000	USD
CY2011Q4	dte	Estimated Future Capital Expenditures For Next Year EstimatedFutureCapitalExpendituresForNextYear	1900000000	USD
CY2009	dte	Eps Net Income Less Distributed Earnings EpsNetIncomeLessDistributedEarnings	183000000	USD
CY2011	dte	Eps Net Income Less Distributed Earnings EpsNetIncomeLessDistributedEarnings	318000000	USD
CY2011	dte	Gas Cost Reconciliation Over Recovery GasCostReconciliationOverRecovery	9000000	USD
	dte	Gas Main Renewal Program Capital Expenditures GasMainRenewalProgramCapitalExpenditures	17000000	USD
	dte	Gas Main Renewal Program Implentation Time Period GasMainRenewalProgramImplentationTimePeriod	10	years
	dte	Expected Permanent Capital Structure Debt Percent ExpectedPermanentCapitalStructureDebtPercent	0.510	percent
	dte	Expected Permanent Capital Structure Equity Percent ExpectedPermanentCapitalStructureEquityPercent	0.490	percent
CY2010Q4	dte	Expense Related To Refueling Outages ExpenseRelatedToRefuelingOutages	3000000	USD
CY2011Q4	dte	Expense Related To Refueling Outages ExpenseRelatedToRefuelingOutages	23000000	USD
CY2011	dte	Expiration Period After Date Of Grant ExpirationPeriodAfterDateOfGrant	10	years
CY2011	dte	Fair Value Measurements With Unobservable Inputs Reconciliation Gains And Loses Recorded In Regulatory Assets Liabilities FairValueMeasurementsWithUnobservableInputsReconciliationGainsAndLosesRecordedInRegulatoryAssetsLiabilities	2000000	USD
	dte	Gas Meter Move Out Program Capital Expenditures GasMeterMoveOutProgramCapitalExpenditures	22000000	USD
	dte	Gas Meter Move Out Program Implementation Time Period GasMeterMoveOutProgramImplementationTimePeriod	10	years
	dte	Gcr Plan Case Factor Current Year And Next Year GcrPlanCaseFactorCurrentYearAndNextYear	5.89	MCF
CY2011	dte	Gcr Plan Case Factor Next Year And Following Year GcrPlanCaseFactorNextYearAndFollowingYear	5	MCF
CY2009	dte	Goodwill Of Gathering And Processing Assets GoodwillOfGatheringAndProcessingAssets	13000000	USD
CY2011Q4	dte	Grantor Trust Balance GrantorTrustBalance	13000000	USD
CY2009	dte	Gross Proceeds From Sale Of Gathering And Processing Assets GrossProceedsFromSaleOfGatheringAndProcessingAssets	45000000	USD
CY2011Q4	dte	Guarantee Obligations Maximum Exposure One GuaranteeObligationsMaximumExposureOne	10000000	USD
CY2011Q4	dte	Health Care Trend Decrease In Percentage Point HealthCareTrendDecreaseInPercentagePoint	1	percent
CY2011Q4	dte	Health Care Trend Increase In Percentage Point HealthCareTrendIncreaseInPercentagePoint	1
CY2011Q2	dte	Income Tax Benefit IncomeTaxBenefit	87000000	USD
CY2010	dte	Income Tax Reconciliation Income Tax Exepnse Benefit Goodwill Attributed To Sale Of Gas Utility Subsidiaries IncomeTaxReconciliationIncomeTaxExepnseBenefitGoodwillAttributedToSaleOfGasUtilitySubsidiaries	0	USD
CY2009	dte	Income Tax Reconciliation Income Tax Exepnse Benefit Goodwill Attributed To Sale Of Gas Utility Subsidiaries IncomeTaxReconciliationIncomeTaxExepnseBenefitGoodwillAttributedToSaleOfGasUtilitySubsidiaries	4000000	USD
CY2011	dte	Income Tax Reconciliation Income Tax Exepnse Benefit Goodwill Attributed To Sale Of Gas Utility Subsidiaries IncomeTaxReconciliationIncomeTaxExepnseBenefitGoodwillAttributedToSaleOfGasUtilitySubsidiaries	0	USD
CY2009	dte	Increase Decrease In Recoverable Pension And Postretirement Costs IncreaseDecreaseInRecoverablePensionAndPostretirementCosts	-19000000	USD
CY2011	dte	Increase Decrease In Recoverable Pension And Postretirement Costs IncreaseDecreaseInRecoverablePensionAndPostretirementCosts	-620000000	USD
CY2010	dte	Increase Decrease In Recoverable Pension And Postretirement Costs IncreaseDecreaseInRecoverablePensionAndPostretirementCosts	-32000000	USD
CY2011Q4	dte	Inflation Rate Used To Determine Estimated Decommissioning Expenditures InflationRateUsedToDetermineEstimatedDecommissioningExpenditures	0.06	percent
CY2011	dte	Insurance Coverage For Extra Expensewhen To Necessitate Power Plant When Unavailable InsuranceCoverageForExtraExpensewhenToNecessitatePowerPlantWhenUnavailable	490000000	USD
CY2011Q4	dte	Intangible Assets Emission Allowance IntangibleAssetsEmissionAllowance	9000000	USD
CY2010Q4	dte	Intangible Assets Emission Allowance IntangibleAssetsEmissionAllowance	9000000	USD
CY2010Q4	dte	Intangible Assets Renewable Energy Credits IntangibleAssetsRenewableEnergyCredits	17000000	USD
CY2011Q4	dte	Intangible Assets Renewable Energy Credits IntangibleAssetsRenewableEnergyCredits	27000000	USD
CY2011	dte	Interest Rate Is Reset Every Three Months InterestRateIsResetEveryThreeMonths	3	months
CY2011	dte	Jointly Owned Utility Plant Number Of Plants JointlyOwnedUtilityPlantNumberOfPlants	2	facilities
CY2011	dte	Limit Deferred Premium Charges Per Year LimitDeferredPremiumChargesPerYear	17500000	USD
CY2011Q4	dte	Line Of Credit Facility Current Borrowing LineOfCreditFacilityCurrentBorrowing	115000000	USD
CY2011Q4	dte	Long Term Debt Maturities Repayment Of Principal LongTermDebtMaturitiesRepaymentOfPrincipal	7693000000	USD
CY2011	dte	Maintenance Of Public Liability Insurance For Nuclear Power Plants MaintenanceOfPublicLiabilityInsuranceForNuclearPowerPlants	375000000	USD
CY2011	dte	Maturities On Temporary Investments MaturitiesOnTemporaryInvestments	3	months
CY2011Q4	dte	Maximum Additional Margin Financing MaximumAdditionalMarginFinancing	50000000	USD
CY2011	dte	Maximum Amount Of Years To Incur Additional Capital Expenditures MaximumAmountOfYearsToIncurAdditionalCapitalExpenditures	6	years
CY2011Q4	dte	Maximum Percentage Of Commitment To Bank In Any Facility MaximumPercentageOfCommitmentToBankInAnyFacility	0.0850	percent
CY2011Q4	dte	Maximum Total Funded Debt To Total Capitalization Ratio MaximumTotalFundedDebtToTotalCapitalizationRatio	0.65	ratio
CY2011Q4	dte	Maximum Total Funded Debt To Total Capitilization Ration Denominator MaximumTotalFundedDebtToTotalCapitilizationRationDenominator	1	ratio
CY2011Q2	dte	Michigan Corporate Income Tax MichiganCorporateIncomeTax	0.06	percent
CY2011	dte	Minimum Amount Of Years To Incur Additional Capital Expenditures MinimumAmountOfYearsToIncurAdditionalCapitalExpenditures	4	years
	dte	Mpsc Approved Annual Rate Increase MpscApprovedAnnualRateIncrease	175000000	USD
	dte	Mpsc Approved Return On Equity MpscApprovedReturnOnEquity	0.105	percent
CY2011Q1	dte	Mpsc Authorized Recovery Of Uncollectibe Expense MpscAuthorizedRecoveryOfUncollectibeExpense	31000000	USD
	dte	Mpsc Authorized Refund To Customer Bills MpscAuthorizedRefundToCustomerBills	7000000	USD
	dte	Mpsc Authorized Surcharges To Recover Restoration Expenses MpscAuthorizedSurchargesToRecoverRestorationExpenses	19500000	USD
CY2010Q4	dte	Performance Share Awards Outstanding Shares PerformanceShareAwardsOutstandingShares	1527253	shares
CY2011	dte	Neil Policies Against Terroism Loss NeilPoliciesAgainstTerroismLoss	3200000000	USD
	dte	Net Over Recovery Of Power Supply Cost Recovery Expense NetOverRecoveryOfPowerSupplyCostRecoveryExpense	15600000	USD
CY2011Q1	dte	Net Under Recovery Of Power Suppy Cost Recovery Expense NetUnderRecoveryOfPowerSuppyCostRecoveryExpense	52600000	USD
	dte	New Composite Depreciation Rates NewCompositeDepreciationRates	0.0306	percent
CY2010Q2	dte	Non Pension Component Of Cost To Achieve Included In Regulatory Assets NonPensionComponentOfCostToAchieveIncludedInRegulatoryAssets	21000000	USD
CY2011Q4	dte	Non Vested Stock Options NonVestedStockOptions	666486	shares
CY2011	dte	Notes Receivable Considered Delinquent Maximum Due Date NotesReceivableConsideredDelinquentMaximumDueDate	120	Days
CY2011	dte	Notes Receivable Considered Delinquent Minimum Due Date NotesReceivableConsideredDelinquentMinimumDueDate	60	Days
CY2011Q4	dte	Nuclear Decommissioning Liabilities Funded Through Surcharge And Included In Aro Balance NuclearDecommissioningLiabilitiesFundedThroughSurchargeAndIncludedInAroBalance	1400000000	USD
CY2011Q4	dte	Number Of Citizens Gas Customers NumberOfCitizensGasCustomers	17000	customers
CY2011	dte	Number Of Defendant Oil Power And Coal Companies In Domestic District Court On Basis Of Which Company Named NumberOfDefendantOilPowerAndCoalCompaniesInDomesticDistrictCourtOnBasisOfWhichCompanyNamed	24	people
CY2011Q4	dte	Number Of Electric Utility Customers NumberOfElectricUtilityCustomers	2100000	customers
CY2011Q4	dte	Number Of Gas Utility Customers NumberOfGasUtilityCustomers	1200000	customers
CY2011	dte	Number Of People In Country Claiming Business Activities Contributing To Global Warming Higher Temperatures And Storm Activity NumberOfPeopleInCountryClaimingBusinessActivitiesContributingToGlobalWarmingHigherTemperaturesAndStormActivity	400	people
CY2011Q4	dte	Number Of Represented Employees NumberOfRepresentedEmployees	5000	employees
CY2011	dte	Options Exercised Shares OptionsExercisedShares	-2040229	shares
	dte	Overy Recovery On Refund For Self Implemented Rates OveryRecoveryOnRefundForSelfImplementedRates	3800000	USD
CY2011Q4	dte	Ownership Interest With Lessee OwnershipInterestWithLessee	0.40	percent
CY2010Q2	dte	Pension Componenet Of Costs To Achieve Included In Regulatory Liabilities PensionComponenetOfCostsToAchieveIncludedInRegulatoryLiabilities	11000000	USD
CY2011Q4	dte	Performance Bonds Outstanding PerformanceBondsOutstanding	23000000	USD
CY2011Q4	dte	Performance Share Awards Outstanding Shares PerformanceShareAwardsOutstandingShares	1608733	shares
CY2011	dte	Performance Units PerformanceUnits	1000000	performance
CY2011	dte	Performance Units Price Per Unit PerformanceUnitsPricePerUnit	1.00	performance
CY2011	dte	Period Expenses Related To Refueling Outages Are Accrued PeriodExpensesRelatedToRefuelingOutagesAreAccrued	18	months
CY2011Q4	dte	Period For Extension Of Renewal Options Of Capital Lease Contract PeriodForExtensionOfRenewalOptionsOfCapitalLeaseContract	5	years
CY2011Q4	dte	Period For Extension Of Renewal Options Of Capital Lease Contract2 PeriodForExtensionOfRenewalOptionsOfCapitalLeaseContract2	5	years
CY2011Q4	dte	Period For Extenstion Of Renewal Options Of Capital Lease Contract1 PeriodForExtenstionOfRenewalOptionsOfCapitalLeaseContract1	3	years
CY2011	dte	Period Gas Utility Can Amortize Mgp Costs PeriodGasUtilityCanAmortizeMgpCosts	10	years
CY2011	dte	Period Of Coverage Of Policy For Extra Expenses PeriodOfCoverageOfPolicyForExtraExpenses	3	years
CY2011	dte	Period Of Gas Cost Recovery Reconciliation PeriodOfGasCostRecoveryReconciliation	12	years
CY2011	dte	Period To Apply Approved Electric Utility Choice Icentive Mechanism Surcharges PeriodToApplyApprovedElectricUtilityChoiceIcentiveMechanismSurcharges	12	months
CY2011	dte	Period To Implement Electric Utilities Renewable Energy Plan PeriodToImplementElectricUtilitiesRenewableEnergyPlan	20	years
	dte	Period To Recover Surcharges For Retm And Lct PeriodToRecoverSurchargesForRetmAndLct	3	months
CY2011	dte	Plant And Equipment Expenditures Non Utility PlantAndEquipmentExpendituresNonUtility	102000000	USD
CY2009	dte	Plant And Equipment Expenditures Non Utility PlantAndEquipmentExpendituresNonUtility	75000000	USD
CY2010	dte	Plant And Equipment Expenditures Non Utility PlantAndEquipmentExpendituresNonUtility	88000000	USD
CY2011	dte	Plant And Equipment Expenditures Utility PlantAndEquipmentExpendituresUtility	1382000000	USD
CY2010	dte	Plant And Equipment Expenditures Utility PlantAndEquipmentExpendituresUtility	1011000000	USD
CY2009	dte	Plant And Equipment Expenditures Utility PlantAndEquipmentExpendituresUtility	960000000	USD
CY2011	dte	Possible Additional Capital Exepnditures For Epa Regulations PossibleAdditionalCapitalExepndituresForEpaRegulations	80000000	USD
CY2010	dte	Possible Additional Capital Exepnditures For Epa Regulations PossibleAdditionalCapitalExepndituresForEpaRegulations	55000000	USD
CY2011	dte	Possible Environmental Capital Expenditures To Comply With Requirements PossibleEnvironmentalCapitalExpendituresToComplyWithRequirements	1000000	USD
	dte	Possible Refund Calculations For Revenue Decoupling Mechanism Maximum PossibleRefundCalculationsForRevenueDecouplingMechanismMaximum	71000000	USD
	dte	Power Supply Cost Recovery Expense Forecast For Current Year PowerSupplyCostRecoveryExpenseForecastForCurrentYear	1200000000	USD
	dte	Power Supply Cost Recovery Expense Forecast Next Year PowerSupplyCostRecoveryExpenseForecastNextYear	1400000000	USD
	dte	Power Supply Cost Recovery Plan Case Factor Current Year PowerSupplyCostRecoveryPlanCaseFactorCurrentYear	2.98	kWh
	dte	Power Supply Cost Recovery Plan Case Factor Next Year PowerSupplyCostRecoveryPlanCaseFactorNextYear	4.18	kWh
	dte	Power Supply Cost Recovery Under Collection One Year Prior PowerSupplyCostRecoveryUnderCollectionOneYearPrior	36000000	USD
CY2010Q2	dte	Pre Tax Amount Of Cost To Achieve Previously Expensed Deferred And Recognized In Income PreTaxAmountOfCostToAchievePreviouslyExpensedDeferredAndRecognizedInIncome	32000000	USD
CY2011	dte	Primary Coverage PrimaryCoverage	500000000	USD
CY2011Q4	dte	Production Tax Credits Earned In Prior Years But Not Utilized Carried Forward Indefinitely As Alternative Minimum Tax Credits ProductionTaxCreditsEarnedInPriorYearsButNotUtilizedCarriedForwardIndefinitelyAsAlternativeMinimumTaxCredits	294000000	USD
	dte	Projected Power Supply Cost Recovery Under Recovery For Current Year ProjectedPowerSupplyCostRecoveryUnderRecoveryForCurrentYear	158000000	USD
CY2011Q4	dte	Property Plant And Equipment Accumulated Depreciation Nonutility And Other PropertyPlantAndEquipmentAccumulatedDepreciationNonutilityAndOther	-688000000	USD
CY2010Q4	dte	Property Plant And Equipment Accumulated Depreciation Nonutility And Other PropertyPlantAndEquipmentAccumulatedDepreciationNonutilityAndOther	-525000000	USD
CY2010Q4	dte	Proposed Extension Of Nuclear Plant2 License ProposedExtensionOfNuclearPlant2License	20	years
	dte	Proposed Refund Of Restoration And Line Clearance Expense ProposedRefundOfRestorationAndLineClearanceExpense	16000000	USD
CY2011Q4	dte	Public Utilites Property Plant And Equipment Accumulated Depreciation Other PublicUtilitesPropertyPlantAndEquipmentAccumulatedDepreciationOther	-413000000	USD
CY2010Q4	dte	Public Utilites Property Plant And Equipment Accumulated Depreciation Other PublicUtilitesPropertyPlantAndEquipmentAccumulatedDepreciationOther	-512000000	USD
CY2010Q4	dte	Public Utilities Property Plant And Equipment Accumulated Depreciationstorage PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciationstorage	-108000000	USD
CY2011Q4	dte	Public Utilities Property Plant And Equipment Accumulated Depreciationstorage PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciationstorage	-127000000	USD
CY2011Q4	dte	Public Utilities Property Plant And Equipment Storage PublicUtilitiesPropertyPlantAndEquipmentStorage	406000000	USD
CY2010Q4	dte	Public Utilities Property Plant And Equipment Storage PublicUtilitiesPropertyPlantAndEquipmentStorage	395000000	USD
CY2011Q4	dte	Rdm Refund Range Maximum First Pilot RdmRefundRangeMaximumFirstPilot	140000000	USD
CY2011Q4	dte	Rdm Refund Range Maximum Second Pilot RdmRefundRangeMaximumSecondPilot	130000000	USD
CY2011	dte	Receivables Due Date ReceivablesDueDate	21	Days
CY2011Q2	dte	Reduction Of Net Deferred Tax Assets ReductionOfNetDeferredTaxAssets	0	USD
CY2011	dte	Renewal Of Credit Facility Time Period RenewalOfCreditFacilityTimePeriod	5	years
CY2011Q2	dte	Reduction Of Net Deferred Tax Assets1 ReductionOfNetDeferredTaxAssets1	308000000	USD
CY2011Q4	dte	Rdm Refund Range Minimum First Pilot RdmRefundRangeMinimumFirstPilot	56000000	USD
CY2011Q4	dte	Rdm Refund Range Minimum Second Pilot RdmRefundRangeMinimumSecondPilot	10000000	USD
CY2011	dte	Time Period Required By Non Bypassable Securitization Bond Surcharge To Recover Securitized Regulatory Asset TimePeriodRequiredByNonBypassableSecuritizationBondSurchargeToRecoverSecuritizedRegulatoryAsset	14	years
CY2011Q4	dte	Time Period To Pay Benefit Payments For Qualified And Unqualified Plans TimePeriodToPayBenefitPaymentsForQualifiedAndUnqualifiedPlans	5	years
	dte	To Reduce Nuclear Decommisssioning Surcharge Annually ToReduceNuclearDecommisssioningSurchargeAnnually	20000000	USD
	dte	Uncollectibe Expense Prior Year UncollectibeExpensePriorYear	7000000	USD
	dte	Uncollectible Expense Tracking Mechanism Under Collection Three Years Prior UncollectibleExpenseTrackingMechanismUnderCollectionThreeYearsPrior	24000000	USD
CY2011	dte	Restricted Stock Awards Activity Forfeitures Weighted Average Fair Value Per Share RestrictedStockAwardsActivityForfeituresWeightedAverageFairValuePerShare	40.92
CY2011	dte	Restricted Stock Awards Activity Shares Granted RestrictedStockAwardsActivitySharesGranted	381840	shares
CY2011Q4	dte	Restricted Stock Awards Outstanding Shares RestrictedStockAwardsOutstandingShares	726224	shares
CY2010Q4	dte	Restricted Stock Awards Outstanding Shares RestrictedStockAwardsOutstandingShares	757414	shares
CY2011	dte	Revised Annual Rate Increase RevisedAnnualRateIncrease	188000000	USD
CY2011Q4	dte	Revolving Credit Facilities With Syndicate Number Of Banks RevolvingCreditFacilitiesWithSyndicateNumberOfBanks	20	banks
	dte	Requested Authority To Refund Revenue Decoupling Mechanism RequestedAuthorityToRefundRevenueDecouplingMechanism	56000000	USD
	dte	Requested Net Recovery Of Retm And Lct RequestedNetRecoveryOfRetmAndLct	44000000	USD
CY2011Q3	dte	Requested Recovery For Revenue Decoupling Mechanism RequestedRecoveryForRevenueDecouplingMechanism	20000000	USD
	dte	Requested Recovery Net Of Self Implementation Credit Applied Per Mpsc Order RequestedRecoveryNetOfSelfImplementationCreditAppliedPerMpscOrder	73000000	USD
CY2010	dte	Requested Recovery Of Electric Utility Choice Incentive Mechanism RequestedRecoveryOfElectricUtilityChoiceIncentiveMechanism	105000000	USD
CY2011Q1	dte	Requested Recovery Of Restoration Expenses RequestedRecoveryOfRestorationExpenses	19500000	USD
CY2011Q1	dte	Requesting Authority To Refund Uncollectible Expense To Customers RequestingAuthorityToRefundUncollectibleExpenseToCustomers	7000000	USD
	dte	Reserve And Impairment Of Retirement Obligation ReserveAndImpairmentOfRetirementObligation	6000000	USD
CY2011	dte	Restricted Stock Award Activity Forfeitures RestrictedStockAwardActivityForfeitures	-66675	shares
CY2011	dte	Restricted Stock Award Activity Vested And Issued RestrictedStockAwardActivityVestedAndIssued	-346355	shares
CY2011	dte	Restricted Stock Award Activity Vested And Isued Weighted Average Fair Value Per Share RestrictedStockAwardActivityVestedAndIsuedWeightedAverageFairValuePerShare	38.25
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
	dte	Self Implemented Rate Increase SelfImplementedRateIncrease	107000000	USD
CY2011	dte	Share Based Compensation Arrangements Other Than Options Payout In Period ShareBasedCompensationArrangementsOtherThanOptionsPayoutInPeriod	-467688	shares
CY2011	dte	Specific Review Of Probable Future Collections Based On Receivable Balances In Excess Of90 Days SpecificReviewOfProbableFutureCollectionsBasedOnReceivableBalancesInExcessOf90Days	30	Days
CY2011	dte	Time Period Bonds Were Remarketed For TimePeriodBondsWereRemarketedFor	5	years
CY2011Q4	dte	Time Period For Aggregate Benefit Payments For Qualified And Non Qualtified Benefit Plans TimePeriodForAggregateBenefitPaymentsForQualifiedAndNonQualtifiedBenefitPlans	5	years
CY2011Q4	dte	Time Period Of Unrecognized Tax Benefits That Would Impact Effective Tax Rate TimePeriodOfUnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	12	months
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
	dte	Under Recovery For Pension Equalization Mechanism UnderRecoveryForPensionEqualizationMechanism	7100000	USD
CY2011Q4	dte	Unrealized Losses Recognized As Regulatory Assets UnrealizedLossesRecognizedAsRegulatoryAssets	67000000	USD
CY2010Q4	dte	Unrealized Losses Recognized As Regulatory Assets UnrealizedLossesRecognizedAsRegulatoryAssets	26000000	USD
CY2011Q4	dte	Value Of Transactions Company Would Have Been Exposed To If Credit Rating Below Investment Grade ValueOfTransactionsCompanyWouldHaveBeenExposedToIfCreditRatingBelowInvestmentGrade	315000000	USD
CY2011	dte	Vulnerable Household Warmth Fund Amount To Be Collected VulnerableHouseholdWarmthFundAmountToBeCollected	48000000	USD
CY2011Q4	dte	Weighted Average Grant Date Fair Value Per Share Balance WeightedAverageGrantDateFairValuePerShareBalance	42.25
CY2010Q4	dte	Weighted Average Grant Date Fair Value Per Share Balance WeightedAverageGrantDateFairValuePerShareBalance	37.32
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q4
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	0000936340
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	169403378	shares
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2011Q2	dei	Entity Public Float EntityPublicFloat	8500000000	USD
CY2011	dei	Entity Registrant Name EntityRegistrantName	DTE ENERGY CO

Files In Submission

Name	View Source	Status
0000936340-12-000004-index-headers.html	Edgar Link	pending
0000936340-12-000004-index.html	Edgar Link	pending
0000936340-12-000004.txt	Edgar Link	pending
0000936340-12-000004-xbrl.zip	Edgar Link	pending
a20111231ex3171.htm	Edgar Link	pending
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comparisonofcumulativefiveye.jpg	Edgar Link	pending
dte-20111231.xml	Edgar Link	completed
dte-20111231.xsd	Edgar Link	pending
dte-20111231_cal.xml	Edgar Link	unprocessable
dte-20111231_def.xml	Edgar Link	unprocessable
dte-20111231_lab.xml	Edgar Link	unprocessable
dte-20111231_pre.xml	Edgar Link	unprocessable
dteenergy2011123110k.htm	Edgar Link	pending
ex23-25.htm	Edgar Link	pending
exhibit-12x49.htm	Edgar Link	pending
exhibit216.htm	Edgar Link	pending
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$DTE
DTE ENERGY CO Stock $dte

2010 Q4 Form 10-K Financial Statement

#000093634012000004 Filed on February 16, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$DTE DTE ENERGY CO Stock $dte

2010 Q4 Form 10-K Financial Statement

#000093634012000004 Filed on February 16, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$DTE
DTE ENERGY CO Stock $dte