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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024
Income Tax Benefits [Line Items] |  |  |  |
Deferred income taxes and investment tax credits |  | $ 103 | $ 96 |
Consumers Energy Company |  |  |  |
Income Tax Benefits [Line Items] |  |  |  |
Deferred income taxes and investment tax credits |  | $ 99 | $ 107 |
Consumers Energy Company | Renewable Energy Tax Credit |  |  |  |
Income Tax Benefits [Line Items] |  |  |  |
Deferred income taxes and investment tax credits | $ 37 |  |  |
Adjustment for production |  |  |  | $ 51

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- Definition Amount of deferred income tax expense (benefit) and income tax credits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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