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Income Taxes (Summary of Loss and Credit Carryforwards) (Details) $ in Millions | Dec. 31, 2024 USD ($)
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Operating Loss Carryforwards [Line Items] |
General business credits | $ 216
Total tax attributes | 258
Consumers Energy Company |
Operating Loss Carryforwards [Line Items] |
General business credits | 8
Total tax attributes | 37
Michigan State Tax Authority |
Operating Loss Carryforwards [Line Items] |
Local net operating loss carryforwards | 38
Michigan State Tax Authority | Consumers Energy Company |
Operating Loss Carryforwards [Line Items] |
Local net operating loss carryforwards | 29
Arkansas State Tax Authority |
Operating Loss Carryforwards [Line Items] |
Local net operating loss carryforwards | 2
Local Tax Authority |
Operating Loss Carryforwards [Line Items] |
Local net operating loss carryforwards | $ 2

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards and deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + 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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards. + 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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