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Acquisitions and Dispositions (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
Apr. 02, 2015
Significant Acquisitions and Disposals [Line Items]      
Payments to acquire businesses $ 29,000,000us-gaap_PaymentsToAcquireBusinessesGross    
Duke Energy Ohio [Member] | Midwest Generation Business [Member] | Subsequent Event [Member]      
Significant Acquisitions and Disposals [Line Items]      
Disposal Group, Including Discontinued Operation, Consideration     2,800,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ dei_LegalEntityAxis
= duk_DukeEnergyOhioMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= duk_MidwestGenerationBusinessMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Scenario, Forecast [Member] | Duke Energy Progress [Member] | NCEMPA Generating Assets [Member]      
Significant Acquisitions and Disposals [Line Items]      
Payments to acquire businesses   $ 1,200,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= duk_DukeEnergyProgressMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= duk_NCEMPAGeneratingAssetsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember