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Earnings Per Share - CMS Energy (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | May 31, 2023
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Principal (In Millions) | $ 3,556 |
CMS Energy |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Principal (In Millions) | 800 |
CMS Energy | 3.375% Convertible Senior Notes Due 2028 | Convertible debt |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Principal (In Millions) | $ 800 | $ 800

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