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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Net amount recognized in accumulated other comprehensive income | [1] | $ 19 | $ (7) | $ (6)
Progress Energy |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Net amount recognized in accumulated other comprehensive income |  | (5) | (1) | $ 1
Pension Plan | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 367 | (261) |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Deferred income tax expense |  | (7) | 1 |
Amortization of prior year actuarial gain |  | 37 | (8) |
Amortization of prior year service credit |  |  | 1 |
Net amount recognized in accumulated other comprehensive income |  | 30 | (6) |
Pension Plan | Duke Energy Carolinas | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 221 | (57) |
Pension Plan | Progress Energy | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 107 | (128) |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Deferred income tax expense |  | (1) |  |
Amortization of prior year actuarial gain |  | 2 | (1) |
Net amount recognized in accumulated other comprehensive income |  | 1 | (1) |
Pension Plan | Duke Energy Progress | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 101 | (31) |
Pension Plan | Duke Energy Florida | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 5 | (97) |
Pension Plan | Duke Energy Ohio | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (1) | (17) |
Pension Plan | Duke Energy Indiana | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (12) | (19) |
Pension Plan | Piedmont | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | 9 | (5) |
Other Post-Retirement Benefit Plans |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (79) | (15) |
Regulatory liabilities, net increase (decrease) |  | 27 | 23 |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Amortization of prior year actuarial gain |  | 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 liabilities, net increase (decrease) |  |  | 12 |
Other Post-Retirement Benefit Plans | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (80) | (18) |
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (45) | (9) |
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  | (36) | (9) |
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net increase (decrease) |  |  | 4 |
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) |  | (3) | (4) |
Regulatory liabilities, net increase (decrease) |  | 19 | 1 |
Other Post-Retirement Benefit Plans | Piedmont |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory liabilities, net increase (decrease) |  | $ (5) | $ 2 |
[1] | Net of income tax expense of approximately $52 million for the year ended December 31, 2022, and income tax benefit of approximately $17 million and $35 million for the years ended December 31, 2021, and 2020, respectively.

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