v3.25.4

Income Taxes (Summary of Principal Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Deferred income tax assets |  |
Net regulatory tax liability | $ 294 | $ 307
Tax loss and credit carryforwards | 139 | 258
Reserves and accruals | 16 | 27
Total deferred income tax assets | 449 | 592
Valuation allowance | (2) | (1)
Total deferred income tax assets, net of valuation allowance | 447 | 591
Deferred income tax liabilities |  |
Plant, property, and equipment | (2,833) | (2,682)
Employee benefits | (558) | (507)
Gas inventory | (24) | (38)
Securitized costs | (137) | (167)
Other | (147) | (122)
Total deferred income tax liabilities | (3,699) | (3,516)
Total net deferred income tax liabilities | (3,252) | (2,925)
Consumers Energy Company |  |
Deferred income tax assets |  |
Net regulatory tax liability | 294 | 307
Tax loss and credit carryforwards | 18 | 37
Reserves and accruals | 13 | 24
Total deferred income tax assets, net of valuation allowance | 325 | 368
Deferred income tax liabilities |  |
Plant, property, and equipment | (2,808) | (2,658)
Employee benefits | (534) | (489)
Gas inventory | (24) | (38)
Securitized costs | (137) | (167)
Other | (23) | (69)
Total deferred income tax liabilities | (3,526) | (3,421)
Total net deferred income tax liabilities | $ (3,201) | $ (3,053)

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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from tax carryforwards and the excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived regulatory assets and liabilities. + 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 temporary differences from reserves and accruals. + 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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