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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Revolving Credit Facility - USD ($) | Jun. 30, 2025 | Mar. 31, 2025 | Feb. 28, 2025
--- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |
Facility size | $ 10,000,000,000 | $ 10,000,000,000 | $ 9,000,000,000
Commercial paper | (3,017,000,000) |  |
Outstanding letters of credit | (14,000,000) |  |
Tax-exempt bonds | (81,000,000) |  |
Available capacity under the Master Credit Facility | 6,888,000,000 |  |
Duke Energy Carolinas |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,000,000,000 |  |
Commercial paper | (300,000,000) |  |
Outstanding letters of credit | (4,000,000) |  |
Tax-exempt bonds | 0 |  |
Available capacity under the Master Credit Facility | 696,000,000 |  |
Duke Energy Progress |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,125,000,000 |  |
Commercial paper | (150,000,000) |  |
Outstanding letters of credit | (1,000,000) |  |
Tax-exempt bonds | 0 |  |
Available capacity under the Master Credit Facility | 974,000,000 |  |
Duke Energy Florida |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,150,000,000 |  |
Commercial paper | (1,000,000) |  |
Outstanding letters of credit | (7,000,000) |  |
Tax-exempt bonds | 0 |  |
Available capacity under the Master Credit Facility | 1,142,000,000 |  |
Duke Energy Ohio |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 950,000,000 |  |
Commercial paper | (26,000,000) |  |
Outstanding letters of credit | 0 |  |
Tax-exempt bonds | 0 |  |
Available capacity under the Master Credit Facility | 924,000,000 |  |
Duke Energy Indiana |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 800,000,000 |  |
Commercial paper | (150,000,000) |  |
Outstanding letters of credit | 0 |  |
Tax-exempt bonds | (81,000,000) |  |
Available capacity under the Master Credit Facility | 569,000,000 |  |
Piedmont |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility size | 1,050,000,000 |  |
Commercial paper | (5,000,000) |  |
Outstanding letters of credit | 0 |  |
Tax-exempt bonds | 0 |  |
Available capacity under the Master Credit Facility | 1,045,000,000 |  |
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 | 3,925,000,000 |  |
Commercial paper | (2,385,000,000) |  |
Outstanding letters of credit | (2,000,000) |  |
Tax-exempt bonds | 0 |  |
Available capacity under the Master Credit Facility | $ 1,538,000,000 |  |

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