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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($) | Jun. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Facility size | $ 9,000,000,000 | $ 9,000,000,000
Commercial paper | (3,271,000,000) |
Outstanding letters of credit | (38,000,000) |
Tax-exempt bonds | (81,000,000) |
Available capacity under the Master Credit Facility | 5,610,000,000 |
Duke Energy Carolinas |  |
Line of Credit Facility [Line Items] |  |
Facility size | 1,400,000,000 |
Commercial paper | (307,000,000) |
Outstanding letters of credit | (4,000,000) |
Tax-exempt bonds | 0 |
Available capacity under the Master Credit Facility | 1,089,000,000 |
Duke Energy Progress |  |
Line of Credit Facility [Line Items] |  |
Facility size | 1,500,000,000 |
Commercial paper | (813,000,000) |
Outstanding letters of credit | (1,000,000) |
Tax-exempt bonds | 0 |
Available capacity under the Master Credit Facility | 686,000,000 |
Duke Energy Florida |  |
Line of Credit Facility [Line Items] |  |
Facility size | 875,000,000 |
Commercial paper | (227,000,000) |
Outstanding letters of credit | (7,000,000) |
Tax-exempt bonds | 0 |
Available capacity under the Master Credit Facility | 641,000,000 |
Duke Energy Ohio |  |
Line of Credit Facility [Line Items] |  |
Facility size | 1,050,000,000 |
Commercial paper | (348,000,000) |
Outstanding letters of credit | 0 |
Tax-exempt bonds | 0 |
Available capacity under the Master Credit Facility | 702,000,000 |
Duke Energy Indiana |  |
Line of Credit Facility [Line Items] |  |
Facility size | 950,000,000 |
Commercial paper | (150,000,000) |
Outstanding letters of credit | 0 |
Tax-exempt bonds | (81,000,000) |
Available capacity under the Master Credit Facility | 719,000,000 |
Piedmont |  |
Line of Credit Facility [Line Items] |  |
Facility size | 950,000,000 |
Commercial paper | (623,000,000) |
Outstanding letters of credit | 0 |
Tax-exempt bonds | 0 |
Available capacity under the Master Credit Facility | 327,000,000 |
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants |  |
Line of Credit Facility [Line Items] |  |
Commercial paper | (625,000,000) |
Duke Energy (Parent) | Duke Energy (Parent) |  |
Line of Credit Facility [Line Items] |  |
Facility size | 2,275,000,000 |
Commercial paper | (803,000,000) |
Outstanding letters of credit | (26,000,000) |
Tax-exempt bonds | 0 |
Available capacity under the Master Credit Facility | $ 1,446,000,000 |

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