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v3.19.1

Business Segments (Narrative) (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 24, 2019 USD ($) asset | Mar. 31, 2019 USD ($) segment | Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |
Pretax (gain) loss on disposal |  | $ 3 | $ 100
Operation, maintenance and other |  | 1,419 | 1,464
Duke Energy Ohio [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Pretax (gain) loss on disposal |  |  | 106
Operation, maintenance and other |  | $ 132 | 131
Number of reportable segments | segment |  | 2 |
Beckjord [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Pretax (gain) loss on disposal |  |  | 106
Operation, maintenance and other |  |  | $ 1
Subsequent Event [Member] | Certain Renewable Assets [Member] | Commercial Renewables [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Pretax proceeds from sale | $ 415 |  |
Subsequent Event [Member] | Operating Wind, Solar and Battery Storage Assets [Member] | Commercial Renewables [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Ownership percent divested | 49.00% |  |
Assets divested | asset | 37 |  |
Subsequent Event [Member] | Operating Solar assets [Member] | Commercial Renewables [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Ownership percent divested | 33.00% |  |
Assets divested | asset | 11 |  |

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