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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated other comprehensive (income) loss |  |  |  |
Net amount recognized in accumulated other comprehensive income | [1] | $ (8) | $ 1 | $ 19
Progress Energy |  |  |  |
Accumulated other comprehensive (income) loss |  |  |  |
Net amount recognized in accumulated other comprehensive income |  | 0 | 2 | $ (5)
Pension Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 147 | 5 |
Accumulated other comprehensive (income) loss |  |  |  |
Deferred income tax benefit |  | 3 |  |
Amortization of prior year service credit |  | 1 |  |
Amortization of prior year service credit |  | (12) | (2) |
Net amount recognized in accumulated other comprehensive income |  | (8) | (2) |
Pension Plan | Duke Energy Carolinas |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 39 | (14) |
Pension Plan | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 33 | 8 |
Accumulated other comprehensive (income) loss |  |  |  |
Amortization of prior year service credit |  | 1 |  |
Net amount recognized in accumulated other comprehensive income |  | 1 |  |
Pension Plan | Duke Energy Progress |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 1 |  |
Pension Plan | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 31 | 9 |
Pension Plan | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 11 | (3) |
Pension Plan | Duke Energy Indiana |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 6 | (2) |
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 increase |  | 16 | 13 |
Other Post-Retirement Benefit Plans |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | (42) | 73 |
Regulatory liabilities, net (decrease) increase |  | (76) | 41 |
Accumulated other comprehensive (income) loss |  |  |  |
Amortization of prior year service credit |  |  | 1 |
Amortization of prior year actuarial gain |  | 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 increase |  | (62) | 79 |
Regulatory liabilities, net (decrease) increase |  | (71) | 62 |
Other Post-Retirement Benefit Plans | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 23 | (7) |
Regulatory liabilities, net (decrease) increase |  | 12 |  |
Accumulated other comprehensive (income) loss |  |  |  |
Amortization of prior year actuarial gain |  |  | (1) |
Net amount recognized in accumulated other comprehensive income |  |  | (1) |
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 17 | (5) |
Regulatory liabilities, net (decrease) increase |  | 12 |  |
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | 5 |  |
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | (1) | (2) |
Regulatory liabilities, net (decrease) increase |  | (3) | (4) |
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  | (3) | (2) |
Regulatory liabilities, net (decrease) increase |  | $ (12) | (8) |
Other Post-Retirement Benefit Plans | Piedmont |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase |  |  | $ 1 |
[1] | Net of income tax expense of approximately $70 million, $40 million and $52 million for the years ended December 31, 2024, 2023 and 2022, respectively.

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