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Financings and Capitalization (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Financing And Capitalization [Line Items] |  |
Notes payable | $ 0 | $ 20,000,000
Limitation on payment of stock dividends | 6,900,000,000 |
Dividends paid | $ 305,000,000 |
Consumers Energy Company |  |
Financing And Capitalization [Line Items] |  |
Supplier financing program, payment period | 60 days |
Supplier financing program, termination period | 30 days |
Payables under supplier finance program | $ 23,000,000 | 1,000,000
Unrestricted retained earnings | 2,000,000,000 |
Consumers Energy Company | Related Party |  |
Financing And Capitalization [Line Items] |  |
Notes payable | 6,000,000 | 75,000,000
Consumers Energy Company | Credit Agreement | Related Party |  |
Financing And Capitalization [Line Items] |  |
Maximum borrowing capacity |  | $ 500,000,000
Notes payable | 0 |
Consumers Energy Company | Credit Agreement | Subsidiaries |  |
Financing And Capitalization [Line Items] |  |
Maximum borrowing capacity | 40,000,000 |
Notes payable | $ 6,000,000 |
Interest rate at period end | 6.924% |
Consumers Energy Company | Credit Agreement | Subsidiaries | SOFR |  |
Financing And Capitalization [Line Items] |  |
Basis spread on variable rate | 1.75% |
Consumers Energy Company | Commercial Paper |  |
Financing And Capitalization [Line Items] |  |
Short-term debt authorized borrowings | $ 500,000,000 |
Short-term borrowings outstanding | $ 0 |

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