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v3.24.0.1

Financings and Capitalization (Issuance of Convertible Senior Notes) (Details) $ / shares in Units, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
May 31, 2023 USD ($) d | Jan. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |
Principal (In Millions) |  |  | $ 3,556
Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) |  |  | 2,671
CMS Energy |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) |  |  | 800
3.375% Convertible Senior Notes Due 2028 | Convertible debt | CMS Energy |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) | $ 800 |  | $ 800
Interest rate | 3.375% |  | 3.375%
Unamortized issuance costs | $ 12 |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 73.97
Threshold percentage of stock price trigger | 130.00% |  |
Threshold trading days | d | 20 |  |
Threshold consecutive trading days | d | 30 |  |
Redemption price percentage | 100.00% |  |
4.600% First Mortgage Bonds Due May 2029 | First mortgage bonds | Consumers Energy Company | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Principal (In Millions) |  | $ 600 |
Interest rate |  | 4.60% |

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