Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) GWh Mcf	Dec. 31, 2022 USD ($) GWh Mcf
Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 3,377	$ 2,877
Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	5,984	14,086
Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	903	909
Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,300	$ 500
Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	2,077	2,377
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 800	$ 1,250
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	311	307
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 800	$ 1,250
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,050	$ 800
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	294	292
Progress Energy | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,050	$ 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	294	292
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	800	300
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	800	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	5,264	12,266
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	8	11
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	720	1,820
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	290	299