Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) GWh Mcf	Dec. 31, 2020 USD ($) GWh Mcf
Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 3,592	$ 1,809
Interest Rate Contracts | Designated contracts | Cash flow hedges
Derivative [Line Items]
Notional Amount	2,415	632
Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 1,177	$ 1,177
Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	22,344	35,409
Commodity contracts | Electricity (GWh)(a) | Cash flow hedges
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	9,975	22,048
Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	823	678
Consolidated VIEs | Interest Rate Contracts | Designated contracts | Cash flow hedges
Derivative [Line Items]
Notional Amount	$ 665	$ 632
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	350	400
Duke Energy Carolinas | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 350	$ 400
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	264	145
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Progress Energy | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Progress Energy | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	215	158
Duke Energy Progress | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Duke Energy Progress | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Duke Energy Progress | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	215	158
Duke Energy Ohio | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 27	$ 27
Duke Energy Ohio | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 27	$ 27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	1,681	2,559
Duke Energy Indiana | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 300
Duke Energy Indiana | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 300
Duke Energy Indiana | Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	10,688	10,802
Duke Energy Indiana | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	8	2
Piedmont | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	336	373