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Regulatory Matters - (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025 | Oct. 31, 2024 | May 31, 2024 | Sep. 30, 2025 | Aug. 20, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 2,021 |  | $ 1,743 | $ 6,306 | $ 5,526
Consumers Energy Company |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 1,913 |  | $ 1,661 | 6,007 | $ 5,291
Consumers Energy Company | J.H. Campbell Generating Units |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Financial impact of emergency order | $ 27 |  |  |  |  | $ 53 |  |  |
Revenues | 17 |  |  |  |  | $ 67 |  |  |
Consumers Energy Company | Service Restoration Cost Deferral Application |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory asset | $ 54 |  |  |  | $ 54 |  |  | $ 54 |
Electric Rate Case |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Amended requested annual rate increase |  |  | $ 277 |  |  |  |  |  |
Electric Rate Case | Consumers Energy Company |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual rate increase |  |  |  | $ 325 |  |  |  |  |
Requested annual rate increase, as a percent |  |  |  | 10.25% |  |  |  |  |
Surcharge for the recovery of excess distribution investments |  | $ 22 |  |  |  |  |  |  |
Additional annual rate increase authorized |  | $ 176 |  |  |  |  |  |  |
Rate of return on equity authorized |  | 9.90% |  |  |  |  |  |  |
Electric Rate Case, First Component | Consumers Energy Company |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested annual rate increase |  |  |  | $ 303 |  |  |  |  |
Electric Rate Case, Second Component | Consumers Energy Company |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Surcharge for the recovery of excess distribution investments |  |  |  | $ 22 |  |  |  |  |

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