Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2023 GWh Mcf	Jun. 30, 2023 USD ($) GWh Mcf	Dec. 31, 2022 USD ($)
Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 4,127	$ 2,877
Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	14,086	28,253
Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	909	863
Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 2,100	500
Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		2,027	2,377
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 550	1,250
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	307	290
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 550	1,250
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 1,250	800
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	292	280
Progress Energy | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 1,250	800
Duke Energy Progress | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 250	500
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	292	280
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 250	500
Duke Energy Florida | Interest Rate Contracts
Derivative [Line Items]
Notional amount		1,000	300
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		1,000	300
Duke Energy Indiana | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 200	300
Duke Energy Indiana | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	12,266	24,787
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	11	12
Duke Energy Indiana | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 200	300
Duke Energy Ohio | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 27	27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	1,820	3,466
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		$ 27	$ 27
Piedmont | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	299	281