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Business Segments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on sale |  |  |  |  |  |  |  |  | $ 89 | $ (28) | $ (27)
Operation, maintenance and other |  |  |  |  |  |  |  |  | 6,463 | 5,944 | 6,224
Revenues | $ 6,115 | $ 6,628 | $ 5,643 | $ 6,135 | $ 5,799 | $ 6,482 | $ 5,555 | $ 5,729 | $ 24,521 | 23,565 | 22,743
Duke Energy Progress [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Loss on sale |  |  |  |  |  |  |  |  | $ (9) | (4) | (3)
Operation, maintenance and other |  |  |  |  |  |  |  |  | 1,578 | 1,439 | 1,565
Revenues | 1,366 | 1,582 | 1,291 | 1,460 | 1,251 | 1,460 | 1,199 | 1,219 | $ 5,699 | 5,129 | 5,277
Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Loss on sale |  |  |  |  |  |  |  |  | $ 106 | (1) | (2)
Operation, maintenance and other |  |  |  |  |  |  |  |  | 480 | 530 | 514
Revenues | $ 505 | $ 469 | $ 459 | $ 524 | $ 497 | $ 471 | $ 437 | $ 518 | 1,957 | $ 1,923 | $ 1,944
Beckjord [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on sale |  |  |  |  |  |  |  |  | 106 |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  | 1 |  |
Revenue [Member] | Customer Concentration Risk [Member] | Duke Energy Progress [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 633 |  |

X
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