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Regulatory Matters - (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended
--- | --- | ---
Mar. 31, 2025 | Oct. 31, 2024 | May 31, 2024 | Jun. 30, 2025
Consumers Energy Company |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Financial impact of emergency order |  |  |  | $ 29
Consumers Energy Company | Service Restoration Cost Deferral Application |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory asset |  |  |  | $ 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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