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Exit Activities and Asset Sales (Narrative) (Details) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended | 31 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2025 MW | Apr. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 USD ($)
Wind Project |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Noncontrolling interest capacity (in MW) | MW |  |  |  | 100 |  |  |
Wind Project | Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Proceeds from sale of noncontrolling interest |  |  | $ 40 |  |  |  |
Solar Projects | Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Proceeds from sale of noncontrolling interest |  |  | $ 10 |  |  |  |
Delta Township, Michigan, Solar Project | Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Noncontrolling interest capacity (in MW) | MW | 24 |  |  |  |  |  |
Phillips, Wisconsin, Solar Project | Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Noncontrolling interest capacity (in MW) | MW | 3 |  |  |  |  |  |
ASP gain |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Proceeds from sale of ASP business |  | $ 124 |  | $ 124 | $ 0 | $ 0 |
Gain on disposition of assets |  | $ 110 |  |  |  |  |
Retention Benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Cost deferred |  |  |  | $ 8 | $ 16 |  |
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 |  |  | 3 years
Retention Benefits | J.H. Campbell Generating Units |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected cost |  |  |  | $ 50 |  |  | $ 50
Retention Benefits | J.H. Campbell Generating Units | Retention Incentive Program |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Cost deferred |  |  |  |  |  |  | $ 43

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