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CMS Energy Corporation Consolidated Statements of Income (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Statement [Abstract] |  |  |  |
Tax effect of discontinued operations | $ 0 | $ 7 | $ 1 | $ 16

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