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Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated other comprehensive (income) loss |  |  |  |
Net amount recognized in accumulated other comprehensive income | [1] | $ (13) | $ (8) | $ 1
Pension Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (202) | 147 |
Accumulated other comprehensive (income) loss |  |  |  |
Deferred income tax benefit |  | 3 | 3 |
Amortization of prior year service credit |  |  | 1 |
Amortization of prior year service credit |  | (17) | (12) |
Net amount recognized in accumulated other comprehensive income |  | (14) | (8) |
Pension Plan | Duke Energy Carolinas |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (46) | 39 |
Pension Plan | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (84) | 33 |
Accumulated other comprehensive (income) loss |  |  |  |
Amortization of prior year service credit |  | (1) | 1 |
Net amount recognized in accumulated other comprehensive income |  | (1) | 1 |
Pension Plan | Duke Energy Progress |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (40) | 1 |
Pension Plan | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (43) | 31 |
Pension Plan | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (8) | 11 |
Pension Plan | Duke Energy Indiana |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (6) | 6 |
Accumulated other comprehensive (income) loss |  |  |  |
Amortization of prior year service credit |  |  | (2) |
Net amount recognized in accumulated other comprehensive income |  |  | (2) |
Pension Plan | Piedmont |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (9) | 16 |
Other Post-Retirement Benefit Plans |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (11) | (42) |
Regulatory liabilities, net (decrease) increase |  | (30) | (76) |
Accumulated other comprehensive (income) loss |  |  |  |
Amortization of prior year actuarial gain |  | (1) | 1 |
Net amount recognized in accumulated other comprehensive income |  | (1) | 1 |
Other Post-Retirement Benefit Plans | Duke Energy Carolinas |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (17) | (62) |
Regulatory liabilities, net (decrease) increase |  | (17) | (71) |
Other Post-Retirement Benefit Plans | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | 7 | 23 |
Regulatory liabilities, net (decrease) increase |  | (1) | 12 |
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | 2 | 17 |
Regulatory liabilities, net (decrease) increase |  | (1) | 12 |
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | 5 | 5 |
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  |  | (1) |
Regulatory liabilities, net (decrease) increase |  | (1) | (3) |
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (3) | (3) |
Regulatory liabilities, net (decrease) increase |  | (9) | $ (12) |
Other Post-Retirement Benefit Plans | Piedmont |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net (decrease) increase |  | (1) |  |
Regulatory liabilities, net (decrease) increase |  | $ 1 |  |
[1] | Net of income tax benefit of approximately $9 million for the year ended December 31, 2025, and net of income tax expense of approximately $70 million and $40 million for the years ended December 31, 2024, and 2023, respectively.

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