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v3.19.2

Business Segments (Narrative) (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 24, 2019 USD ($) asset | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Pretax (gain) loss on disposal |  | $ (3) | $ (3) |  | $ 97
Operation, maintenance and other |  | 1,434 | 1,544 | $ 2,853 | 3,008
Duke Energy Ohio [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Pretax (gain) loss on disposal |  |  |  |  | 106
Operation, maintenance and other |  | 123 | $ 130 | $ 255 | $ 261
Number of reportable segments | segment |  |  |  | 2 |
Beckjord [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Pretax (gain) loss on disposal |  |  |  | $ (106) |
Operation, maintenance and other |  |  |  | 1 |
Certain Renewable Assets [Member] | Commercial Renewables [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Pretax proceeds from sale | $ 415 |  |  |  |
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 |  |  |  |
Operating Solar assets [Member] | Commercial Renewables [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Ownership percent divested | 33.00% |  |  |  |
Assets divested | asset | 11 |  |  |  |
Renewable Merchant Plants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment, net |  | $ 160 |  | $ 160 |

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