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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Net amount recognized in accumulated other comprehensive income | [1] | $ (7) | $ (6) | $ (9)
Progress Energy |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Net amount recognized in accumulated other comprehensive income |  | (1) | 1 | $ (2)
Pension Plan | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (261) | (62) |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Deferred income tax expense |  | 1 | 2 |
Amortization of prior year actuarial gain |  | (8) | (11) |
Amortization of prior year service credit |  | 1 | 1 |
Net amount recognized in accumulated other comprehensive income |  | (6) | (8) |
Pension Plan | Duke Energy Carolinas | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (57) | (39) |
Pension Plan | Progress Energy | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (128) | (26) |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Deferred income tax expense |  |  | 1 |
Amortization of prior year actuarial gain |  | (1) | (1) |
Net amount recognized in accumulated other comprehensive income |  | (1) |  |
Pension Plan | Duke Energy Progress | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (31) | (30) |
Pension Plan | Duke Energy Florida | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (97) | 4 |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Deferred income tax expense |  |  | 1 |
Amortization of prior year actuarial gain |  |  | (3) |
Net amount recognized in accumulated other comprehensive income |  |  | (2) |
Pension Plan | Duke Energy Ohio | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (17) | (2) |
Pension Plan | Duke Energy Indiana | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (19) | 5 |
Pension Plan | Piedmont | Qualified Plan |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (5) | (1) |
Other Post-Retirement Benefit Plans |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (15) | 9 |
Regulatory liabilities, net increase |  | 23 | (10) |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract] |  |  |  |
Amortization of prior year actuarial gain |  | (1) |  |
Amortization of prior year service credit |  |  | 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 |  | 12 | (7) |
Other Post-Retirement Benefit Plans | Progress Energy |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (18) | 9 |
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (9) | 6 |
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (9) | 3 |
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | 4 |  |
Regulatory liabilities, net increase |  | 4 |  |
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory assets, net decrease |  | (4) | (4) |
Regulatory liabilities, net increase |  | 1 | $ (1) |
Other Post-Retirement Benefit Plans | Piedmont |  |  |  |
Amounts Recognized in Regulatory Assets and Liabilities [Abstract] |  |  |  |
Regulatory liabilities, net increase |  | $ 2 |  |
[1] | Net of income tax impacts of approximately $17 million and $35 million for the years ended December 31, 2021, and 2020, respectively. Tax impacts are immaterial for other periods presented.

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