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Business Segments (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |
Loss on sale | $ (10) | $ 4 | $ 89
Operation, maintenance and other | 5,788 | 6,066 | 6,463
Revenues | 23,868 | 25,079 | 24,521
Duke Energy Progress |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on sale | (8) |  | (9)
Operation, maintenance and other | 1,332 | 1,446 | 1,578
Revenues | $ 5,422 | 5,957 | 5,699
Number of reportable segments | segment | 1 |  |
Duke Energy Ohio |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on sale |  |  | 106
Operation, maintenance and other | $ 463 | 520 | 480
Revenues | $ 1,858 | $ 1,940 | 1,957
Number of reportable segments | segment | 2 |  |
Revenues | Duke Energy Progress | Customer Concentration | One customer |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 553 |  |
Beckjord |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on sale |  |  | 106
Operation, maintenance and other |  |  | $ 1

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