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Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) GWh Mcf | Dec. 31, 2022 USD ($) GWh Mcf
Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 4,352 | $ 2,877
Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 20,961 | 14,086
Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 841 | 909
Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 1,875 | $ 500
Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 2,477 | 2,377
Duke Energy Carolinas | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 650 | $ 1,250
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 276 | 307
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 650 | $ 1,250
Progress Energy | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 1,500 | $ 800
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 272 | 292
Progress Energy | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 1,500 | $ 800
Duke Energy Progress | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 500 | $ 500
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 272 | 292
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 500 | $ 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 | $ 300 | $ 300
Duke Energy Indiana | Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 18,411 | 12,266
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 21 | 11
Duke Energy Indiana | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 300 | $ 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 | 2,550 | 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 | 272 | 299

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