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Rate and Regulatory Matters (Narrative-Federal) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2024 | May 31, 2020 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Capital expenditures |  |  |  | $ 4,128 | $ 4,319 | $ 3,597
Forecast |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Capital expenditures |  |  | $ 1,300 |  |  |
Final Rate Order | Midwest Independent Transmission System Operator, Inc |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.98% | 10.02% |  |  |  |

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