v3.25.4
Income Taxes (Schedule of Effective Income Rate Reconciliation) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount        
Income from continuing operations before income taxes   $ 1,248 $ 1,123 $ 954
Income tax expense at statutory rate   262 236 200
State and local income taxes, net of federal income tax effect   77 58 40
Renewable energy tax credits   (68) (71) (55)
Other   (6) (6) (7)
Nontaxable or nondeductible items   3 4 3
Changes in unrecognized tax benefits   9 2 (11)
TCJA excess deferred taxes   (42) (43) (40)
Deferred tax adjustment   0 (16) 0
Taxes attributable to noncontrolling interests   15 12 17
Other, net   (4) 0 0
Income tax expense   $ 246 $ 176 $ 147
Percent        
Income tax expense at statutory rate   21.00% 21.00% 21.00%
State and local income taxes, net of federal income tax effect   6.20% 5.10% 4.20%
Renewable energy tax credits   (5.40%) (6.40%) (5.80%)
Other   (0.50%) (0.50%) (0.70%)
Nontaxable or nondeductible items   0.20% 0.40% 0.30%
Changes in unrecognized tax benefits   0.70% 0.20% (1.20%)
TCJA excess deferred taxes   (3.40%) (3.80%) (4.20%)
Deferred tax adjustment   0.00% (1.40%) 0.00%
Taxes attributable to noncontrolling interests   1.20% 1.10% 1.80%
Other, net   (0.30%) 0.00% 0.00%
Effective tax rate   19.70% 15.70% 15.40%
State and local   $ 100 $ 76 $ 38
Consumers Energy Company        
Amount        
Income from continuing operations before income taxes   1,417 1,209 1,028
Income tax expense at statutory rate   298 254 216
State and local income taxes, net of federal income tax effect   80 60 47
Renewable energy tax credits   (46) (51) (43)
Other   (6) (6) (7)
Nontaxable or nondeductible items   3 3 3
Changes in unrecognized tax benefits   9 1 (12)
TCJA excess deferred taxes   (42) (43) (40)
Deferred tax adjustment   0 (16) 0
Other, net   (8) (2) (3)
Income tax expense   $ 288 $ 200 $ 161
Percent        
Income tax expense at statutory rate   21.00% 21.00% 21.00%
State and local income taxes, net of federal income tax effect   5.70% 5.00% 4.60%
Renewable energy tax credits   (3.20%) (4.20%) (4.20%)
Other   (0.40%) (0.50%) (0.70%)
Nontaxable or nondeductible items   0.20% 0.20% 0.30%
Changes in unrecognized tax benefits   0.60% 0.10% (1.20%)
TCJA excess deferred taxes   (3.00%) (3.60%) (3.90%)
Deferred tax adjustment   0.00% (1.30%) 0.00%
Other, net   (0.60%) (0.20%) (0.20%)
Effective tax rate   20.30% 16.50% 15.70%
State and local $ 12 $ 79 $ 68 $ 43
Consumers Energy Company | Non-Michigan Jurisdiction        
Amount        
State and local income taxes, net of federal income tax effect       $ (13)