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Income Taxes (Schedule Of Effective Income Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |
Income from continuing operations before income taxes | $ 823 | $ 809 | $ 764
Income tax expense at statutory rate | 173 | 170 | 160
Increase (decrease) in income taxes from: |  |  |
State and local income taxes, net of federal effect | 39 | 44 | 46
TCJA excess deferred taxes | (50) | (35) | (31)
Production tax credits | (40) | (28) | (20)
Accelerated flow-through of regulatory tax benefits | (28) | (13) | (13)
Research and development tax credits, net | (3) | (11) | (2)
Refund of alternative minimum tax sequestration | 0 | (9) | 0
Other, net | 4 | (3) | (9)
Income tax expense | $ 95 | $ 115 | $ 131
Effective tax rate | 11.50% | 14.20% | 17.10%
Consumers Energy Company |  |  |
Income Taxes [Line Items] |  |  |
Income from continuing operations before income taxes | $ 1,024 | $ 989 | $ 928
Income tax expense at statutory rate | 215 | 208 | 195
Increase (decrease) in income taxes from: |  |  |
State and local income taxes, net of federal effect | 54 | 47 | 53
TCJA excess deferred taxes | (50) | (35) | (31)
Production tax credits | (33) | (19) | (12)
Accelerated flow-through of regulatory tax benefits | (28) | (13) | (13)
Research and development tax credits, net | (3) | (11) | (2)
Other, net | 1 | (4) | (5)
Income tax expense | $ 156 | $ 173 | $ 185
Effective tax rate | 15.20% | 17.50% | 19.90%
Research Tax Credit Carryforward |  |  |
Increase (decrease) in income taxes from: |  |  |
Increase (decrease) in tax credit carryforward |  | $ 9 |
Research Tax Credit Carryforward | Consumers Energy Company |  |  |
Increase (decrease) in income taxes from: |  |  |
Increase (decrease) in tax credit carryforward |  | $ 8 |

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