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Income Taxes (Schedule Of Effective Income Rate Reconciliation) (Details) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Income Taxes [Line Items] |  |
U.S. federal income tax rate | 21.00% | 21.00%
Increase (decrease) in income taxes from: |  |
State and local income taxes, net of federal effect | 5.50% | 5.40%
TCJA excess deferred taxes | (7.20%) | (5.80%)
Production tax credits | (4.70%) | (5.10%)
Accelerated flow-through of regulatory tax benefits | (4.30%) | (3.20%)
Other, net | 0.00% | (0.30%)
Effective tax rate | 10.30% | 12.00%
Consumers Energy Company |  |
Income Taxes [Line Items] |  |
U.S. federal income tax rate | 21.00% | 21.00%
Increase (decrease) in income taxes from: |  |
State and local income taxes, net of federal effect | 5.00% | 5.10%
TCJA excess deferred taxes | (6.70%) | (5.10%)
Production tax credits | (2.70%) | (2.60%)
Accelerated flow-through of regulatory tax benefits | (5.10%) | (3.70%)
Other, net | (0.60%) | (0.40%)
Effective tax rate | 10.90% | 14.30%

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