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Financings and Capitalization (First Mortgage Bond Purchase) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 3,556 |  |
Unamortized discounts | (30) | $ (30) |
Unamortized issuance costs | (135) | (120) |
Long-term debt | 14,508 | 13,122 |
Gain on debt extinguishment |  | 0 | $ 0
Interest on long-term debt | 616 | 509 | 481
Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | 2,671 |  |
Unamortized discounts | (28) | (27) |
Unamortized issuance costs | (73) | (67) |
Long-term debt | 10,037 | 9,192 |
Interest on long-term debt | 415 | 325 | 294
Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | 431 |  |
Long-term debt | 424 | 0 |
CMS Energy |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | 800 |  |
Long-term debt | 4,471 | 3,930 |
Interest on long-term debt | 201 | $ 181 | $ 183
First mortgage bonds |  |  |
Debt Instrument [Line Items] |  |  |
Gain on debt extinguishment | 131 |  |
First mortgage bonds | Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | 431 |  |
Unamortized discounts | (3) |  |
Unamortized issuance costs | (4) |  |
Long-term debt | 424 |  |
First mortgage bonds | CMS Energy |  |  |
Debt Instrument [Line Items] |  |  |
Payment for purchase of first mortgage bonds | $ 293 |  |
First mortgage bonds due 2060 | First mortgage bonds | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.50% |  |
First mortgage bonds due 2060 | First mortgage bonds | Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 163 |  |
First mortgage bonds due 2052 | First mortgage bonds | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.65% |  |
First mortgage bonds due 2052 | First mortgage bonds | Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 106 |  |
First mortgage bonds due 2050 | First mortgage bonds | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.75% |  |
First mortgage bonds due 2050 | First mortgage bonds | Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 23 |  |
First mortgage bonds due 2050 | First mortgage bonds | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.10% |  |
First mortgage bonds due 2050 | First mortgage bonds | Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 52 |  |
First mortgage bonds due 2051 | First mortgage bonds | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.50% |  |
First mortgage bonds due 2051 | First mortgage bonds | Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 27 |  |
First mortgage bonds due 2048 | First mortgage bonds | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.05% |  |
First mortgage bonds due 2048 | First mortgage bonds | Consumers Energy Company | Related Party |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 60 |  |
Repurchased Debt | First mortgage bonds |  |  |
Debt Instrument [Line Items] |  |  |
Interest on long-term debt | $ 5 |  |

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