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v3.20.2

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) GWh Mcf | Dec. 31, 2019 USD ($) GWh Mcf
Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 1,830 | $ 2,270
Commodity contracts | Cash flow hedges |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 11,116 |
Commodity contracts | Electricity (GWh)(a) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 32,314 | 15,858
Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 683 | 704
Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 653 | $ 993
Designated contracts | Interest Rate Contracts | VIE primary beneficiary |  |
Derivative [Line Items] |  |
Notional amount | 653 | 693
Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 1,177 | 1,277
Duke Energy Carolinas | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 400 | $ 450
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 143 | 130
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 400 | $ 450
Progress Energy | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 750 | $ 800
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 156 | 160
Progress Energy | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 750 | $ 800
Duke Energy Progress | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 750 | $ 250
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 156 | 160
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 750 | $ 250
Duke Energy Florida | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 550
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount |  | 550
Duke Energy Ohio | Interest Rate 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 | 4,126 | 1,887
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 27 | $ 27
Duke Energy Indiana | Commodity contracts | Electricity (GWh)(a) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 17,072 | 13,971
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 2 | 3
Piedmont Natural Gas | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 382 | 411

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