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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, 2025 USD ($) GWh Mcf | Dec. 31, 2024 USD ($) GWh Mcf
Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 6,077 | $ 6,027
Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 17,663 | 12,229
Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 790 | 779
Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 1,725 | $ 2,825
Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 4,352 | 3,202
Duke Energy Carolinas | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 2,075 | $ 1,150
Duke Energy Carolinas | Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 0 | 0
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 297 | 276
Duke Energy Carolinas | Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 2,075 | 1,150
Progress Energy | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 1,925 | $ 1,775
Progress Energy | Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 0 | 0
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 274 | 246
Progress Energy | Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Progress Energy | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 1,925 | 1,775
Duke Energy Progress | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 650 | $ 1,125
Duke Energy Progress | Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 0 | 0
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 274 | 246
Duke Energy Progress | Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 650 | 1,125
Duke Energy Florida | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 1,275 | 650
Duke Energy Florida | Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 1,275 | 650
Duke Energy Indiana | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 325 | $ 250
Duke Energy Indiana | Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 15,032 | 10,942
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 22 | 32
Duke Energy Indiana | Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Duke Energy Indiana | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 325 | 250
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 | 2,631 | 1,287
Duke Energy Ohio | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 0 | 0
Duke Energy Ohio | Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 27 | $ 27
Piedmont | Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 0 | 0
Piedmont | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 197 | 225

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