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Consumers Energy Company Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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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

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