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Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis    
Net Assets (Liabilities) as of December 31 $ 24us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs $ (36)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
Transfers into Level 3 (1)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
Transfers out of Level 3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
Total gains (losses):    
Included in earnings (24)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings 14us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
Recorded in regulatory assets/liabilities (2)dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities 4dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
Purchases, issuances and settlements:    
Issuances 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues (1)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues
Settlements (9)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements (24)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
Net Assets (Liabilities) as of March 31 (12)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs (43)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31, 2015 and 2014 and reflected in Operating revenues and Fuel, purchased power and gas in DTE Energy's Consolidated Statements of Operations (96)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss (20)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
DTE Electric    
Fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis    
Net Assets (Liabilities) as of December 31 3us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ dei_LegalEntityAxis
= dte_DTEElectricMember
3us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ dei_LegalEntityAxis
= dte_DTEElectricMember
Total gains (losses):    
Recorded in regulatory assets/liabilities (2)dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ dei_LegalEntityAxis
= dte_DTEElectricMember
4dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ dei_LegalEntityAxis
= dte_DTEElectricMember
Purchases, issuances and settlements:    
Settlements 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ dei_LegalEntityAxis
= dte_DTEElectricMember
(6)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ dei_LegalEntityAxis
= dte_DTEElectricMember
Net Assets (Liabilities) as of March 31 1us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ dei_LegalEntityAxis
= dte_DTEElectricMember
1us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ dei_LegalEntityAxis
= dte_DTEElectricMember
The amount of total gains (losses) included in Regulatory assets and liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31, 2015 and 2014 and reflected in DTE Electric's Consolidated Statements of Operations 0dte_FairValueAssetsMeasuredonRecurringBasisChangeinUnrealizedGainLossincludedinregulatoryassetsandliabilities
/ dei_LegalEntityAxis
= dte_DTEElectricMember
0dte_FairValueAssetsMeasuredonRecurringBasisChangeinUnrealizedGainLossincludedinregulatoryassetsandliabilities
/ dei_LegalEntityAxis
= dte_DTEElectricMember
Natural Gas    
Fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis    
Net Assets (Liabilities) as of December 31 30us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
(52)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Transfers into Level 3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Transfers out of Level 3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Total gains (losses):    
Included in earnings (29)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
(22)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Recorded in regulatory assets/liabilities 0dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
0dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Purchases, issuances and settlements:    
Issuances 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Settlements (1)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
64us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Net Assets (Liabilities) as of March 31 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
(10)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31, 2015 and 2014 and reflected in Operating revenues and Fuel, purchased power and gas in DTE Energy's Consolidated Statements of Operations (91)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
0us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_NaturalGasCommodityContractMember
Electricity    
Fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis    
Net Assets (Liabilities) as of December 31 (5)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
13us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Transfers into Level 3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Transfers out of Level 3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Total gains (losses):    
Included in earnings 7us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
36us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Recorded in regulatory assets/liabilities 0dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
0dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Purchases, issuances and settlements:    
Issuances 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
(1)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Settlements (9)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
(82)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Net Assets (Liabilities) as of March 31 (7)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
(34)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31, 2015 and 2014 and reflected in Operating revenues and Fuel, purchased power and gas in DTE Energy's Consolidated Statements of Operations (3)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
(20)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_ElectricityCommodityContractMember
Other    
Fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis    
Net Assets (Liabilities) as of December 31 (1)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
3us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
Transfers into Level 3 (1)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
Transfers out of Level 3 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
Total gains (losses):    
Included in earnings (2)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
Recorded in regulatory assets/liabilities (2)dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
4dte_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisUnobservableInputsReconciliationGainsLossesRecordedInRegulatoryAssetsLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
Purchases, issuances and settlements:    
Issuances 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
Settlements 1us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
(6)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
Net Assets (Liabilities) as of March 31 (5)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
1us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
The amount of total gains (losses) included in net income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31, 2015 and 2014 and reflected in Operating revenues and Fuel, purchased power and gas in DTE Energy's Consolidated Statements of Operations $ (2)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember
$ 0us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= dte_OtherCommodityContractMember