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Income Taxes (Schedule of Effective Income Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |  |
Income from continuing operations before income taxes | $ 1,123 | $ 954 | $ 902
Income tax expense at statutory rate | 236 | 200 | 189
Increase (decrease) in income taxes from: |  |  |
State and local income taxes, net of federal effect | 60 | 31 | 51
Renewable energy tax credits | (72) | (58) | (51)
TCJA excess deferred taxes | (43) | (40) | (65)
Deferred tax adjustment | (16) | 0 | 0
Taxes attributable to noncontrolling interests | 12 | 17 | 5
Accelerated flow-through of regulatory tax benefits | 0 | 0 | (39)
Other, net | (1) | (3) | 3
Income tax expense | $ 176 | $ 147 | $ 93
Effective tax rate | 15.70% | 15.40% | 10.30%
Consumers Energy Company |  |  |
Income Taxes [Line Items] |  |  |
Income from continuing operations before income taxes | $ 1,209 | $ 1,028 | $ 1,085
Income tax expense at statutory rate | 254 | 216 | 228
Increase (decrease) in income taxes from: |  |  |
State and local income taxes, net of federal effect | 59 | 36 | 59
Renewable energy tax credits | (54) | (46) | (46)
TCJA excess deferred taxes | (43) | (40) | (65)
Deferred tax adjustment | (16) | 0 | 0
Accelerated flow-through of regulatory tax benefits | 0 | 0 | (39)
Other, net | 0 | (5) | 3
Income tax expense | $ 200 | $ 161 | $ 140
Effective tax rate | 16.50% | 15.70% | 12.90%
Consumers Energy Company | Non-Michigan Jurisdiction |  |  |
Increase (decrease) in income taxes from: |  |  |
State and local income taxes, net of federal effect |  | $ (13) |

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