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Income Taxes (Schedule of Effective Income Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 954 | $ 902 | $ 823
Income tax expense at statutory rate | 200 | 189 | 173
Increase (decrease) in income taxes from: |  |  |
State and local income taxes, net of federal effect | 31 | 51 | 39
Renewable energy tax credits | (58) | (51) | (44)
TCJA excess deferred taxes | (40) | (65) | (50)
Taxes attributable to noncontrolling interests | 17 | 5 | 5
Accelerated flow-through of regulatory tax benefits | 0 | (39) | (28)
Other, net | (3) | 3 | 0
Income Tax Expense | $ 147 | $ 93 | $ 95
Effective tax rate | 15.40% | 10.30% | 11.50%
Consumers Energy Company |  |  |
Income Taxes [Line Items] |  |  |
Income Before Income Taxes | $ 1,028 | $ 1,085 | $ 1,024
Income tax expense at statutory rate | 216 | 228 | 215
Increase (decrease) in income taxes from: |  |  |
State and local income taxes, net of federal effect | 36 | 59 | 54
Renewable energy tax credits | (46) | (46) | (37)
TCJA excess deferred taxes | (40) | (65) | (50)
Accelerated flow-through of regulatory tax benefits | 0 | (39) | (28)
Other, net | (5) | 3 | 2
Income Tax Expense | $ 161 | $ 140 | $ 156
Effective tax rate | 15.70% | 12.90% | 15.20%
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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