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Financings and Capitalization (Narrative) (Details) | 1 Months Ended | 12 Months Ended
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Jan. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
Financing And Capitalization [Line Items] |  |  |  |  |
Limitation on payment of stock dividends |  | $ 6,400,000,000 | $ 6,400,000,000 |  |
Dividends paid |  |  | $ 722,000,000 |  |
Common stock authorized (in shares) | shares |  | 350,000,000 | 350,000,000 | 350,000,000.0 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01 | $ 0.01 |  |
Preferred stock authorized (in shares) | shares |  | 10,000,000 | 10,000,000 |  |
Par value of preferred stock (in dollars per share) | $ / shares |  | $ 0.01 | $ 0.01 |  |
Stock offering program maximum value |  |  | $ 500,000,000 |  |
Number of shares required to settle forward contracts (in shares) | shares |  | 94,588 | 94,588 |  |
Issuance of preferred stock, net of issuance costs |  |  | $ 224,000,000 | $ 0 | $ 0
Series C Preferred Stock Depositary Shares |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Preferred stock authorized (in shares) | shares |  | 9,200,000 | 9,200,000 |  |
Number of shares issued (in shares) | shares |  | 9,200,000 | 9,200,000 |  |
Depositary share conversion ratio |  | 0.001 | 0.001 |  |
Issue price (in dollars per share) | $ / shares |  | $ 25.00 | $ 25.00 |  |
Issuance of preferred stock, net of issuance costs |  |  | $ 224,000,000 |  |
Dividend rate |  |  | 4.20% |  |
Optional redemption price (in dollars per share) | $ / shares |  | 25.00 | $ 25.00 |  |
Trading Symbol |  |  | CMS PRC |  |
Series C Preferred Stock |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Optional redemption price (in dollars per share) | $ / shares |  | $ 25,000 | $ 25,000 |  |
Consumers Energy Company Cumulative Preferred Stock, $100 par value: $4.50 Series |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Trading Symbol |  |  | CMS-PB |  |
Consumers Energy Company |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Notes payable – related parties |  | $ 392,000,000 | $ 392,000,000 | $ 307,000,000 |
Unrestricted retained earnings |  | $ 1,800,000,000 | $ 1,800,000,000 |  |
Common stock authorized (in shares) | shares |  | 125,000,000.0 | 125,000,000.0 | 125,000,000.0 |
Preferred stock authorized (in shares) | shares |  | 7,500,000 | 7,500,000 | 7,500,000 |
Consumers Energy Company | Credit Agreement |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 500,000,000 | $ 500,000,000 |  |
Notes payable – related parties |  | $ 392,000,000 | $ 392,000,000 |  |
Interest rate |  | 0.00% | 0.00% |  |
Consumers Energy Company | Credit Agreement | Subsequent Event |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Repayment of note payable - related party | $ 392,000,000 |  |  |  |
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 | $ 0 |  |

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