v3.26.1
Income Taxes (Schedule of Effective Income Rate Reconciliation) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Percent      
Income tax expense at statutory rate   21.00% 21.00%
State and local income taxes, net of federal income tax effect   5.50% 7.20%
Renewable energy tax credits   (5.50%) (5.70%)
Other   (0.60%) (0.20%)
Nontaxable or nondeductible items   0.20% 0.20%
Changes in unrecognized tax benefits   3.90% 0.50%
Taxes attributable to noncontrolling interests   4.30% 1.30%
TCJA excess deferred taxes   (3.30%) (3.60%)
Property differences   (0.014) (0.005)
Other, net   (0.10%) 0.20%
Effective tax rate   24.00% 20.40%
Consumers Energy Company      
Percent      
Income tax expense at statutory rate   21.00% 21.00%
State and local income taxes, net of federal income tax effect   4.60% 6.70%
Renewable energy tax credits   (4.30%) (3.30%)
Other   (0.50%) (0.40%)
Nontaxable or nondeductible items   0.20% 0.20%
Changes in unrecognized tax benefits   3.00% 0.40%
TCJA excess deferred taxes   (2.50%) (3.00%)
Property differences   (0.011) (0.003)
Other, net   0.20% (0.30%)
Effective tax rate   20.60% 21.00%
State deferred tax balances $ 12