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Financings and Capitalization (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Financing And Capitalization [Line Items] |  |
Limitation on payment of stock dividends | $ 6,600,000,000 |
Dividends paid | 275,000,000 |
Stock offering program maximum value | 500,000,000 |
Net cash required to settle forward contracts | $ 11,000,000 |
Number of shares required to settle forward contracts (in shares) | 162,487 |
Consumers Energy Company |  |
Financing And Capitalization [Line Items] |  |
Notes payable – related parties | $ 0 | $ 392,000,000
Unrestricted retained earnings | 1,900,000,000 |
Consumers Energy Company | Credit Agreement |  |
Financing And Capitalization [Line Items] |  |
Maximum borrowing capacity | 500,000,000 |
Notes payable – related parties | $ 0 |
Consumers Energy Company | Credit Agreement | London Interbank Offered Rate (LIBOR) |  |
Financing And Capitalization [Line Items] |  |
Basis spread on variable rate | 0.10% |
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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