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Regulatory Matters - Quarterly Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Jan. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Operating Revenue |  |  | $ 1,920 | $ 1,558 | $ 4,294 | $ 3,571 |  |
Regulatory assets | $ 3,367 |  | 3,367 |  | 3,367 |  | $ 2,259 |
Regulatory liabilities | 3,873 |  | 3,873 |  | 3,873 |  | 3,802 |
Consumers Energy Company |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Operating Revenue |  |  | 1,802 | $ 1,493 | 4,085 | $ 3,430 |  |
Regulatory assets | 3,367 |  | 3,367 |  | 3,367 |  | 2,259 |
Regulatory liabilities | 3,873 |  | 3,873 |  | 3,873 |  | 3,802 |
Consumers Energy Company | Radio Tower Assets |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory liabilities | $ 7 |  | 7 |  | 7 |  |  |
Consumers Energy Company | J.H. Campbell Generating Units |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Rate of return on equity authorized | 9.00% |  |  |  |  |  |  |
Regulatory assets | $ 1,300 |  | 1,300 |  | 1,300 |  |  |
Consumers Energy Company | Electric Rate Case |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimate of disallowed costs | 22 |  | 22 |  | 22 |  |  |
Recommended disallowed costs |  |  |  |  |  |  |  | $ 11
Additional annual rate increase authorized |  | $ 5 |  |  |  |  |  |
Consumers Energy Company | Energy Waste Reduction Plan Incentive |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested recovery/collection | 46 |  | 46 |  | 46 |  |  |
Operating Revenue |  |  |  |  |  |  | $ 46 |
Consumers Energy Company | GCR underrecoveries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Underrecovery for gas fuel and power supply costs | 23 |  | 23 |  | 23 |  |  |
Consumers Energy Company | PSCR underrecoveries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Underrecovery for gas fuel and power supply costs | $ 153 |  | $ 153 |  | $ 153 |  |  |

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