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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Activities      
Net Income $ 532us-gaap_NetIncomeLoss $ 487us-gaap_NetIncomeLoss $ 486us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 927us-gaap_DepreciationDepletionAndAmortization 896us-gaap_DepreciationDepletionAndAmortization 822us-gaap_DepreciationDepletionAndAmortization
Nuclear fuel amortization 48dteelectric_Nuclearfuelamortization 38dteelectric_Nuclearfuelamortization 29dteelectric_Nuclearfuelamortization
Allowance for equity funds used during construction (21)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (14)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (12)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Deferred income taxes 297us-gaap_DeferredIncomeTaxesAndTaxCredits 108us-gaap_DeferredIncomeTaxesAndTaxCredits (52)us-gaap_DeferredIncomeTaxesAndTaxCredits
Asset (gains) losses and impairments, net (1)us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges (3)us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges (2)us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Changes in assets and liabilities:      
Accounts receivable, net 33us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables (30)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables 24us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Inventories (97)us-gaap_IncreaseDecreaseInInventories 36us-gaap_IncreaseDecreaseInInventories 7us-gaap_IncreaseDecreaseInInventories
Accounts payable 11us-gaap_IncreaseDecreaseInAccountsPayable (23)us-gaap_IncreaseDecreaseInAccountsPayable (64)us-gaap_IncreaseDecreaseInAccountsPayable
Regulatory assets and liabilities (926)us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities 1,029us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities 286us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities
Accrued pension liability — affiliates 495dteelectric_IncreaseDecreaseinPensionPlanObligationsAffiliates (663)dteelectric_IncreaseDecreaseinPensionPlanObligationsAffiliates 137dteelectric_IncreaseDecreaseinPensionPlanObligationsAffiliates
Accrued postretirement liability — affiliates 151dteelectric_IncreaseDecreaseinPostretirementObligationsAffiliates (417)dteelectric_IncreaseDecreaseinPostretirementObligationsAffiliates (221)dteelectric_IncreaseDecreaseinPostretirementObligationsAffiliates
Other assets (25)us-gaap_IncreaseDecreaseInOtherOperatingAssets 0us-gaap_IncreaseDecreaseInOtherOperatingAssets 30us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other liabilities (40)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 44us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 42us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash from operating activities 1,384us-gaap_NetCashProvidedByUsedInOperatingActivities 1,488us-gaap_NetCashProvidedByUsedInOperatingActivities 1,512us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities      
Plant and equipment expenditures (1,561)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,325)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,230)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Notes receivable from affiliate 192us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent (200)us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent 26us-gaap_IncreaseDecreaseInNotesReceivableRelatedPartiesCurrent
Proceeds from sale of nuclear decommissioning trust fund assets 1,146us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments 1,118us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments 759us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments
Investment in nuclear decommissioning trust funds (1,156)us-gaap_PaymentsToAcquireOtherInvestments (1,134)us-gaap_PaymentsToAcquireOtherInvestments (764)us-gaap_PaymentsToAcquireOtherInvestments
Other (10)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (31)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (21)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used for investing activities (1,389)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,572)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,230)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities      
Issuance of long-term debt, net of issuance costs 942us-gaap_ProceedsFromIssuanceOfLongTermDebt 768us-gaap_ProceedsFromIssuanceOfLongTermDebt 496us-gaap_ProceedsFromIssuanceOfLongTermDebt
Redemption of long-term debt (837)us-gaap_RepaymentsOfLongTermDebt (590)us-gaap_RepaymentsOfLongTermDebt (587)us-gaap_RepaymentsOfLongTermDebt
Capital contribution by parent company 190us-gaap_ProceedsFromContributionsFromParent 400us-gaap_ProceedsFromContributionsFromParent 0us-gaap_ProceedsFromContributionsFromParent
Short-term borrowings, net — other 50dteelectric_ProceedsfromRepaymentsofShorttermDebtOther (130)dteelectric_ProceedsfromRepaymentsofShorttermDebtOther 130dteelectric_ProceedsfromRepaymentsofShorttermDebtOther
Short-term borrowings, net — affiliate 26dteelectric_ProceedsfromRepaymentsofShorttermDebtAffiliate (22)dteelectric_ProceedsfromRepaymentsofShorttermDebtAffiliate 16dteelectric_ProceedsfromRepaymentsofShorttermDebtAffiliate
Dividends on common stock (370)us-gaap_PaymentsOfDividendsCommonStock (342)us-gaap_PaymentsOfDividendsCommonStock (317)us-gaap_PaymentsOfDividendsCommonStock
Other (9)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (3)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (3)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash from (used for) financing activities (8)us-gaap_NetCashProvidedByUsedInFinancingActivities 81us-gaap_NetCashProvidedByUsedInFinancingActivities (265)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase (Decrease) in Cash and Cash Equivalents (13)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 17us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of the Period 27us-gaap_CashAndCashEquivalentsAtCarryingValue 30us-gaap_CashAndCashEquivalentsAtCarryingValue 13us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of the Period 14us-gaap_CashAndCashEquivalentsAtCarryingValue 27us-gaap_CashAndCashEquivalentsAtCarryingValue 30us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash information      
Cash paid (received) for: Interest (net of interest capitalized) 240us-gaap_InterestPaidNet 256us-gaap_InterestPaidNet 280us-gaap_InterestPaidNet
Cash paid (received) for: Income taxes 4us-gaap_IncomeTaxesPaidNet 183us-gaap_IncomeTaxesPaidNet 223us-gaap_IncomeTaxesPaidNet
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]      
Plant and equipment expenditures in accounts payable $ 162us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 231us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 144us-gaap_CapitalExpendituresIncurredButNotYetPaid