v3.26.3
Income Taxes (Schedule of Effective Income Rate Reconciliation) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Jun. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Percent      
Income tax expense at statutory rate   21.00% 21.00%
State and local income taxes, net of federal income tax effect   7.40% 6.40%
Renewable energy tax credits   (12.50%) (5.70%)
Other   (1.30%) (0.50%)
Nontaxable or nondeductible items   0.60% 0.30%
Changes in unrecognized tax benefits   5.30% 0.70%
Taxes attributable to noncontrolling interests   15.80% 1.20%
TCJA excess deferred taxes   (8.10%) (3.50%)
Property differences   (0.032) (0.004)
Other, net   0.40% 0.80%
Effective tax rate   25.40% 20.30%
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   4.50% 5.80%
Renewable energy tax credits   (3.70%) (3.30%)
Other   (0.40%) (0.40%)
Nontaxable or nondeductible items   0.20% 0.30%
Changes in unrecognized tax benefits   1.80% 0.60%
TCJA excess deferred taxes   (2.50%) (3.00%)
Property differences   (0.010) (0.003)
Effective tax rate   19.90% 20.70%
State deferred tax balances $ 12