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v3.23.1

Exit Activities - Narrative (Details) - Retention Benefits - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 42 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cost deferred | $ 5 | $ 1 |  |  |  |
D.E. Karn Generating Complex |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Aggregate cost incurred |  |  |  |  |  | $ 31
Retention and severance costs |  |  |  | $ 16 |  |
D.E. Karn Generating Complex | Forecast |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cost |  |  |  |  | $ 2 |
D.E. Karn Generating Complex | Retention Incentive Program |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cost deferred |  |  |  | 12 |  |
D.E. Karn Generating Complex | Property, Plant and Equipment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Costs incurred and capitalized |  |  |  | 4 |  |
J.H. Campbell Generating Units |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cost | $ 50 |  | $ 50 | $ 50 |  |
J.H. Campbell Generating Units | Retention Incentive Program |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cost deferred |  |  | $ 24 |  |  |

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