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CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Statement of Comprehensive Income [Abstract]        
Net gain (loss) arising during the period, tax $ (1) $ 0 $ 0 $ 0
Amortization of net actuarial loss, tax 0 0 1 1
Amortization of prior service credit, tax 0 0 0 0
Unrealized gain on derivative instruments, tax 0 0 1 0
Reclassification adjustments included in net income , tax $ 0 $ 0 $ 0 $ 1