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Consolidated Statements of Operations (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Net unrealized gains (losses) on cash flow hedges, tax $ 6us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Progress Energy [Member]  
Reclassification of cash flow hedges to regulatory assets, tax 62duk_OtherComprehensiveIncomeReclassificationOfCashFlowHedgesToRegulatoryAssetsTax
/ dei_LegalEntityAxis
= duk_ProgressEnergyMember
Duke Energy Progress [Member]  
Reclassification of cash flow hedges to regulatory assets, tax 46duk_OtherComprehensiveIncomeReclassificationOfCashFlowHedgesToRegulatoryAssetsTax
/ dei_LegalEntityAxis
= duk_DukeEnergyProgressMember
Duke Energy Florida [Member]  
Reclassification of cash flow hedges to regulatory assets, tax $ 16duk_OtherComprehensiveIncomeReclassificationOfCashFlowHedgesToRegulatoryAssetsTax
/ dei_LegalEntityAxis
= duk_DukeEnergyFloridaMember