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v3.25.3

Income Taxes (Schedule of Effective Income Rate Reconciliation) (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
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 |  |  | 7.20% | 5.40%
Renewable energy tax credits |  |  | (5.70%) | (6.30%)
TCJA excess deferred taxes |  |  | (3.50%) | (3.80%)
Deferred tax adjustment |  |  | 0.00% | (1.90%)
Taxes attributable to noncontrolling interests |  |  | 1.20% | 1.10%
Other, net |  |  | 0.10% | (0.20%)
Effective tax rate |  |  | 20.30% | 15.30%
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 |  |  | 6.50% | 5.00%
Renewable energy tax credits |  |  | (3.60%) | (4.40%)
TCJA excess deferred taxes |  |  | (3.00%) | (3.50%)
Deferred tax adjustment |  |  | 0.00% | (1.80%)
Other, net |  |  | (0.20%) | (0.20%)
Effective tax rate |  |  | 20.70% | 16.10%
Change in tax policy | $ 12 |  |  |
Consumers Energy Company | Tax Year 2018 And 2019 |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |
Income tax benefit from statutory time limit expiration |  | $ 16 |  |

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- Definition Amount of deferred state and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, deferred regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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