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Stock-Based Compensation (Schedule Of Compensation Cost For Share-Based Payment Arrangements, Allocation Of Share-Based Compensation Costs By Plan) (Details) - Restricted stock - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of shares that vested during the year | $ 25 | $ 22 | $ 26
Compensation expense recognized | 22 | 11 | 22
Income tax benefit recognized | 1 | 3 | 1
Consumers Energy Company |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of shares that vested during the year | 24 | 21 | 25
Compensation expense recognized | 21 | 10 | 21
Income tax benefit recognized | $ 1 | $ 3 | $ 1

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