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Exit Activities and Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended | 15 Months Ended | 48 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2021 | Mar. 31, 2022 | Oct. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2023 | Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Gain on sale |  |  |  | $ 0 | $ 5 | $ 657 |  |
Discontinued Operations, Held-for-sale | EnerBank |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses | $ 1,000 |  |  |  |  |  |  |
Gain on sale |  |  | $ 657 |  | 5 | $ 657 |  |
Gain from divestiture of business related to post-closing adjustment |  | $ 6 |  |  |  |  |  |
Retention Benefits |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Cost deferred |  |  |  | $ 16 | 24 |  |  |
Retention Benefits | D.E. Karn Generating Complex and J.H. Campbell Generating Units | Retention incentive program |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Regulatory asset collection period |  |  |  | 3 years |  |  |  |
Retention Benefits | D.E. Karn Generating Complex |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Aggregate cost incurred |  |  |  |  | $ 32 |  |  |
Retention and severance costs |  |  |  |  |  |  |  | $ 16
Retention Benefits | D.E. Karn Generating Complex | Retention incentive program |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Cost deferred |  |  |  |  |  |  |  | 12
Retention Benefits | D.E. Karn Generating Complex | Property, Plant and Equipment |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Costs incurred and capitalized |  |  |  |  |  |  |  | $ 4
Retention Benefits | J.H. Campbell Generating Units |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected cost |  |  |  | $ 50 |  |  |  |
Retention Benefits | J.H. Campbell Generating Units | Retention incentive program |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Cost deferred |  |  |  |  |  |  | $ 35 |

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