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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

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