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Regulatory Matters - Quarterly Narrative (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities |  | $ 88 |  |  | $ 104
Consumers Energy Company |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities |  | $ 88 |  |  | 104
Consumers Energy Company | Electric Rate Case |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Additional annual rate increase authorized | $ 155 |  |  |  |
Rate of return on equity authorized | 9.90% |  |  |  |
Surcharge for the recovery of excess distribution investments | $ 6 |  |  |  |
Consumers Energy Company | Voluntary refund mechanism |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 22
Consumers Energy Company | Contributions to programs assisting vulnerable gas customers |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities |  |  |  | $ 5 |
Consumers Energy Company | Bill assistance to support vulnerable electric customers |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities |  |  | $ 9 |  |
Consumers Energy Company | Incremental vegetation management |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities |  |  | $ 8 |  |

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