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Commitments and Contingencies (Narrative) (Details) $ in Millions						1 Months Ended	3 Months Ended
	Feb. 08, 2016 USD ($)	Mar. 10, 2015 USD ($)	Feb. 02, 2014 T gal	Aug. 10, 2011	Aug. 09, 2011	Mar. 31, 2014 USD ($)	Mar. 31, 2016 USD ($) Claims	Dec. 31, 2015 USD ($)	Aug. 18, 2014 gal
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual							$ 181.0	$ 166.0
Brazil Expansion Lawsuit [Member]
Valuation and Qualifying Accounts [Abstract]
Obligation to expand installed generation capacity, percent				15.00%	15.00%
Duke Energy Carolinas [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual							11.0	11.0
Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| Dan River [Member]
Valuation and Qualifying Accounts [Abstract]
Civil Penalty Assessed	$ 6.8
Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| Minimum [Member] \| Dan River [Member]
Valuation and Qualifying Accounts [Abstract]
Coal ash released, in tons \| T			30,000
Basin water released, in gallons \| gal			24,000,000
Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| Maximum [Member] \| Dan River [Member]
Valuation and Qualifying Accounts [Abstract]
Coal ash released, in tons \| T			39,000
Basin water released, in gallons \| gal			27,000,000
Duke Energy Carolinas [Member] \| Asbestos Issue [Member]
Valuation and Qualifying Accounts [Abstract]
Asbestos-related injuries and damages reserves							527.0	536.0
Reinsurance retention policy, excess retention, amount reinsured							847.0
Probable insurance recoveries							$ 600.0	599.0
Duke Energy Carolinas [Member] \| Asbestos Issue [Member] \| Non Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number \| Claims							118
Asbestos-related injuries and damages reserves							$ 30.0
Duke Energy Carolinas [Member] \| Asbestos Issue [Member] \| Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number \| Claims							68
Asbestos-related injuries and damages reserves							$ 10.0
Duke Energy Carolinas [Member] \| Groundwater Violation [Member]
Valuation and Qualifying Accounts [Abstract]
Charge for settlement agreement							1.0
Progress Energy [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual							54.0	54.0
Duke Energy Progress [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual							6.0	6.0
Duke Energy Progress [Member] \| North Carolina Ash Basins [Member] \| L V Sutton Plant [Member]
Valuation and Qualifying Accounts [Abstract]
Civil Penalty Assessed		$ 25.0
Duke Energy Progress [Member] \| Groundwater Violation [Member]
Valuation and Qualifying Accounts [Abstract]
Charge for settlement agreement							6.0
Duke Energy Progress [Member] \| Groundwater Violation [Member] \| L V Sutton Plant [Member]
Valuation and Qualifying Accounts [Abstract]
Civil Penalty Assessed		$ 25.0
Duke Energy Florida [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual							31.0	31.0
Duke Energy Florida [Member] \| Westinghouse Electric Company Litigation [Member]
Valuation and Qualifying Accounts [Abstract]
Gain contingency, unrecorded amount							54.0
Loss contingency, damages sought, value						$ 510.0
Duke Energy Ohio [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual							80.0	$ 80.0
Duke Energy Ohio [Member] \| W.C. Beckjord Station [Member]
Valuation and Qualifying Accounts [Abstract]
Gallons of Fuel Released \| gal									9,000
Duke Energy Ohio [Member] \| Antitrust Lawsuit [Member]
Valuation and Qualifying Accounts [Abstract]
Litigation Settlement Amount							$ 81.0