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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated other comprehensive (income) loss |  |  |  |
Net amount recognized in accumulated other comprehensive income | [1] | $ 1 | $ 19 | $ (7)
Progress Energy |  |  |  |
Accumulated other comprehensive (income) loss |  |  |  |
Net amount recognized in accumulated other comprehensive income |  | 2 | (5) | $ (1)
Pension Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 5 | 367 |
Accumulated other comprehensive (income) loss |  |  |  |
Deferred income tax expense |  |  | (7) |
Amortization of prior year service credit |  | (2) | 37 |
Net amount recognized in accumulated other comprehensive income |  | (2) | 30 |
Pension Plan | Duke Energy Carolinas |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (14) | 221 |
Pension Plan | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 8 | 107 |
Accumulated other comprehensive (income) loss |  |  |  |
Deferred income tax expense |  |  | (1) |
Amortization of prior year service credit |  |  | 2 |
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 (decrease) |  |  | 101 |
Pension Plan | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 9 | 5 |
Pension Plan | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (3) | (1) |
Pension Plan | Duke Energy Indiana |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (2) | (12) |
Pension Plan | Piedmont |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 13 | 9 |
Other Post-Retirement Benefit Plans |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 73 | (79) |
Regulatory liabilities, net increase (decrease) |  | 41 | 27 |
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 (decrease) |  | 79 |  |
Regulatory liabilities, net increase (decrease) |  | 62 |  |
Other Post-Retirement Benefit Plans | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (7) | (80) |
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 (decrease) |  | (5) | (45) |
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  |  | (36) |
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (2) |  |
Regulatory liabilities, net increase (decrease) |  | (4) |  |
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (2) | (3) |
Regulatory liabilities, net increase (decrease) |  | (8) | 19 |
Other Post-Retirement Benefit Plans | Piedmont |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | $ 1 |  |
Regulatory liabilities, net increase (decrease) |  |  | $ (5) |
[1] | Net of income tax expense of approximately $40 million and $52 million for the years ended December 31, 2023, and 2022, respectively, and income tax benefit of $17 million for the year ended December 31, 2021.

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