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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |
Tax-exempt bonds | $ (477,000,000) | $ (730,000,000) |
Duke Energy Carolinas |  |  |
Line of Credit Facility [Line Items] |  |  |
Tax-exempt bonds |  | (243,000,000) |
Duke Energy Progress |  |  |
Line of Credit Facility [Line Items] |  |  |
Tax-exempt bonds | (48,000,000) | (48,000,000) |
Duke Energy Ohio |  |  |
Line of Credit Facility [Line Items] |  |  |
Tax-exempt bonds | (77,000,000) | (77,000,000) |
Duke Energy Indiana |  |  |
Line of Credit Facility [Line Items] |  |  |
Tax-exempt bonds | (352,000,000) | $ (362,000,000) |
Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 8,000,000,000 |  | $ 8,000,000,000
Commercial paper | (2,239,000,000) |  |
Outstanding letters of credit | (40,000,000) |  |
Tax-exempt bonds | (81,000,000) |  |
Available capacity | 5,640,000,000 |  |
Revolving Credit Facility | Parent Company |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 2,650,000,000 |  |
Outstanding letters of credit | (34,000,000) |  |
Available capacity | 2,616,000,000 |  |
Revolving Credit Facility | Duke Energy Carolinas |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,475,000,000 |  |
Commercial paper | (736,000,000) |  |
Outstanding letters of credit | (4,000,000) |  |
Available capacity | 735,000,000 |  |
Revolving Credit Facility | Duke Energy Progress |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,250,000,000 |  |
Commercial paper | (407,000,000) |  |
Outstanding letters of credit | (2,000,000) |  |
Available capacity | 841,000,000 |  |
Revolving Credit Facility | Duke Energy Florida |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 800,000,000 |  |
Commercial paper | (179,000,000) |  |
Available capacity | 621,000,000 |  |
Revolving Credit Facility | Duke Energy Ohio |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 625,000,000 |  |
Commercial paper | (176,000,000) |  |
Available capacity | 449,000,000 |  |
Revolving Credit Facility | Duke Energy Indiana |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 600,000,000 |  |
Commercial paper | (257,000,000) |  |
Tax-exempt bonds | (81,000,000) |  |
Available capacity | 262,000,000 |  |
Revolving Credit Facility | Piedmont |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 600,000,000 |  |
Commercial paper | (484,000,000) |  |
Available capacity | 116,000,000 |  |
Proceeds Loaned To Subsidiary Registrants | Revolving Credit Facility | Parent Company |  |  |
Line of Credit Facility [Line Items] |  |  |
Commercial paper | $ (625,000,000) |  |

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