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Consumers Energy Company Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Amortization of net actuarial loss, tax | $ 0 | $ 1 | $ 0 | $ 1
Consumers Energy Company |  |  |  |
Amortization of net actuarial loss, tax | $ 0 | $ 0 | $ 0 | $ 0

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