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Income Taxes (Schedule of Effective Income Rate Reconciliation) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
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 |  |  | 5.40% | 1.70%
Renewable energy tax credits |  |  | (6.30%) | (6.90%)
TCJA excess deferred taxes |  |  | (3.80%) | (3.90%)
Statutory time limit expiration |  |  | (1.90%) | 0.00%
Taxes attributable to noncontrolling interests |  |  | 1.10% | 0.60%
Other, net |  |  | (0.20%) | 0.20%
Effective tax rate |  |  | 15.30% | 12.70%
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% | 2.90%
Renewable energy tax credits |  |  | (4.40%) | (4.50%)
TCJA excess deferred taxes |  |  | (3.50%) | (3.70%)
Statutory time limit expiration |  |  | (1.80%) | 0.00%
Other, net |  |  | (0.20%) | (0.10%)
Effective tax rate |  |  | 16.10% | 15.60%
Consumers Energy Company | Tax Year 2018 And 2019 |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |
Income tax benefit from statutory time limit expiration | $ 16 |  |  |
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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