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Exit Activities (Narrative) (Details) - Retention Benefits - USD ($) $ in Millions | 3 Months Ended | 21 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024
Restructuring Cost and Reserve [Line Items] |  |  |
Cost deferred | $ 3 | $ 5 |
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 |  | 3 years
J.H. Campbell Generating Units |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected cost | $ 50 |  | $ 50
J.H. Campbell Generating Units | Retention incentive program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cost deferred |  |  | $ 38

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