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Commitments and Contingencies (Schedule of Reserves) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Environmental Matters Details [Line Items]    
Reserves for legal matters $ 323us-gaap_LossContingencyAccrualAtCarryingValue $ 204us-gaap_LossContingencyAccrualAtCarryingValue
Duke Energy Carolinas [Member]    
Environmental Matters Details [Line Items]    
Reserves for legal matters 72us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= duk_DukeEnergyCarolinasMember		  
Progress Energy [Member]    
Environmental Matters Details [Line Items]    
Reserves for legal matters 93us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= duk_ProgressEnergyMember		 78us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= duk_ProgressEnergyMember
Duke Energy Progress [Member]    
Environmental Matters Details [Line Items]    
Reserves for legal matters 37us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= duk_DukeEnergyProgressMember		 10us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= duk_DukeEnergyProgressMember
Duke Energy Florida [Member]    
Environmental Matters Details [Line Items]    
Reserves for legal matters $ 36us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= duk_DukeEnergyFloridaMember		 $ 43us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= duk_DukeEnergyFloridaMember