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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - USD ($) | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |
Tax-exempt bonds | $ (360,000,000) |  | $ (477,000,000)
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 | (27,000,000) |  | (77,000,000)
Duke Energy Indiana |  |  |
Line of Credit Facility [Line Items] |  |  |
Tax-exempt bonds | (285,000,000) |  | $ (352,000,000)
Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 8,000,000,000 | $ 8,000,000,000 |
Commercial paper | (2,863,000,000) |  |
Outstanding letters of credit | (38,000,000) |  |
Tax-exempt bonds | (81,000,000) |  |
Available capacity | 5,018,000,000 |  |
Revolving Credit Facility | Parent Company |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 2,650,000,000 |  |
Commercial paper | (1,128,000,000) |  |
Outstanding letters of credit | (25,000,000) |  |
Available capacity | 1,497,000,000 |  |
Revolving Credit Facility | Duke Energy Carolinas |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,225,000,000 |  |
Commercial paper | (506,000,000) |  |
Outstanding letters of credit | (4,000,000) |  |
Available capacity | 715,000,000 |  |
Revolving Credit Facility | Duke Energy Progress |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,150,000,000 |  |
Commercial paper | (307,000,000) |  |
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 | 900,000,000 |  |
Commercial paper | (181,000,000) |  |
Outstanding letters of credit | (7,000,000) |  |
Available capacity | 712,000,000 |  |
Revolving Credit Facility | Duke Energy Ohio |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 775,000,000 |  |
Commercial paper | (119,000,000) |  |
Available capacity | 656,000,000 |  |
Revolving Credit Facility | Duke Energy Indiana |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 600,000,000 |  |
Commercial paper | (150,000,000) |  |
Tax-exempt bonds | (81,000,000) |  |
Available capacity | 369,000,000 |  |
Revolving Credit Facility | Piedmont |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 700,000,000 |  |
Commercial paper | (472,000,000) |  |
Available capacity | 228,000,000 |  |
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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