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Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 USD ($) GWh Mcf | Jun. 30, 2024 GWh Mcf | Dec. 31, 2024 USD ($)
Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 6,502 |  | $ 6,027
Commodity contracts | Electricity (GWh) |  |  |
Derivative [Line Items] |  |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 4,679 | 12,229 |
Commodity contracts | Natural gas (millions of dekatherms) |  |  |
Derivative [Line Items] |  |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 780 | 779 |
Designated contracts | Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 2,975 |  | 2,825
Undesignated contracts | Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | 3,527 |  | 3,202
Duke Energy Carolinas | Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 1,425 |  | 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 | 288 | 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 | 1,425 |  | 1,150
Progress Energy | Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 1,625 |  | 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 | 250 | 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 | 1,625 |  | 1,775
Duke Energy Progress | Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 500 |  | 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 | 250 | 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 | 500 |  | 1,125
Duke Energy Florida | Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | 1,125 |  | 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 | 1,125 |  | 650
Duke Energy Indiana | Interest Rate Contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 450 |  | 250
Duke Energy Indiana | Commodity contracts | Electricity (GWh) |  |  |
Derivative [Line Items] |  |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 4,161 | 10,942 |
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms) |  |  |
Derivative [Line Items] |  |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 26 | 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 | 450 |  | 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 | 518 | 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 | 216 | 225 |

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