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Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) GWh shares Mcf | Dec. 31, 2018 USD ($) GWh Mcf
Call options |  |
Derivative [Line Items] |  |
Aggregate notional amount | shares | 305,000 |
Put options |  |
Derivative [Line Items] |  |
Aggregate notional amount | shares | 305,000 |
Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 2,270 | $ 2,644
Interest Rate Contracts | Designated contracts |  |
Derivative [Line Items] |  |
Notional Amount | 993 | 923
Interest Rate Contracts | Undesignated contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 1,277 | $ 1,721
Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure, in gigawatt-hours | GWh | 15,858 | 15,286
Commodity contracts | Natural gas (millions of Dth) |  |
Derivative [Line Items] |  |
Notional amount, volume in millions of decatherms | Mcf | 704 | 739
VIE | Interest Rate Contracts | Designated contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 693 | $ 422
VIE | Interest Rate Contracts | Undesignated contracts |  |
Derivative [Line Items] |  |
Notional Amount |  | 194
Duke Energy Carolinas | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 450 | 300
Duke Energy Carolinas | Interest Rate Contracts | Designated contracts |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Duke Energy Carolinas | Interest Rate Contracts | Undesignated contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 450 | $ 300
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of Dth) |  |
Derivative [Line Items] |  |
Notional amount, volume in millions of decatherms | Mcf | 130 | 121
Progress Energy | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 800 | $ 1,200
Progress Energy | Interest Rate Contracts | Designated contracts |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Progress Energy | Interest Rate Contracts | Undesignated contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 800 | $ 1,200
Progress Energy | Commodity contracts | Natural gas (millions of Dth) |  |
Derivative [Line Items] |  |
Notional amount, volume in millions of decatherms | Mcf | 160 | 169
Duke Energy Progress | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 250 | $ 650
Duke Energy Progress | Interest Rate Contracts | Designated contracts |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Duke Energy Progress | Interest Rate Contracts | Undesignated contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 250 | $ 650
Duke Energy Progress | Commodity contracts | Natural gas (millions of Dth) |  |
Derivative [Line Items] |  |
Notional amount, volume in millions of decatherms | Mcf | 160 | 166
Duke Energy Florida | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 550 | $ 550
Duke Energy Florida | Interest Rate Contracts | Designated contracts |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Duke Energy Florida | Interest Rate Contracts | Undesignated contracts |  |
Derivative [Line Items] |  |
Notional Amount | 550 | $ 550
Duke Energy Florida | Commodity contracts | Natural gas (millions of Dth) |  |
Derivative [Line Items] |  |
Notional amount, volume in millions of decatherms | Mcf |  | 3
Duke Energy Ohio | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 27 | $ 27
Duke Energy Ohio | Interest Rate Contracts | Designated contracts |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Duke Energy Ohio | Interest Rate Contracts | Undesignated 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 | 1,887 | 1,786
Duke Energy Indiana | Commodity contracts | Electricity (GWh) |  |
Derivative [Line Items] |  |
Notional amount, energy measure, in gigawatt-hours | GWh | 13,971 | 13,500
Duke Energy Indiana | Commodity contracts | Natural gas (millions of Dth) |  |
Derivative [Line Items] |  |
Notional amount, volume in millions of decatherms | Mcf | 3 | 1
Piedmont | Commodity contracts | Natural gas (millions of Dth) |  |
Derivative [Line Items] |  |
Notional amount, volume in millions of decatherms | Mcf | 411 | 448

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