v3.25.4

Financings and Capitalization (First Mortgage Bond Purchase) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |
Payment for purchase of first mortgage bonds | $ 1,150 | $ 952 | $ 2,132
Interest on long-term debt | 798 | 700 | 616
Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Payment for purchase of first mortgage bonds | 115 | 389 | 1,654
Interest on long-term debt | 521 | 488 | 415
First mortgage bonds |  |  |
Debt Instrument [Line Items] |  |  |
Gain on extinguishment of debt | 72 | 110 | 131
First mortgage bonds | Consumers Energy Company | Repurchased Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest on long-term debt | 28 | 19 | 5
First mortgage bonds | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | 184 | 404 | 431
Payment for purchase of first mortgage bonds | $ 109 | $ 289 | $ 293

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