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Consumers Energy Company Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net gain (loss) arising during the period, tax $ 2 $ 0 $ 6
Amortization of net actuarial loss, tax 0 1 2
Consumers Energy Company      
Net gain (loss) arising during the period, tax 0 5 1
Amortization of net actuarial loss, tax $ 0 $ 0 $ 1