v3.25.4
Other Income and Other Expense (Summary of Components of Other Income and Other Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other Income and Expenses [Line Items]      
Allowance for equity funds used during construction $ 23 $ 29 $ 7
Income from equity method investees 5 7 7
All other 13 11 13
Other income 151 207 195
Donations (10) (18) (1)
Civic and political expenditures (7) (5) (5)
All other (10) (9) (7)
Total other expense (27) (32) (13)
First mortgage bonds      
Other Income and Expenses [Line Items]      
Gain on extinguishment of debt 72 110 131
Nonrelated Party      
Other Income and Expenses [Line Items]      
Interest income 37 50 37
Related Party      
Other Income and Expenses [Line Items]      
Interest income 1 0 0
Consumers Energy Company      
Other Income and Expenses [Line Items]      
Allowance for equity funds used during construction 23 29 7
All other 6 9 12
Other income 55 85 49
Donations (10) (18) (1)
Civic and political expenditures (5) (5) (5)
All other (7) (7) (6)
Total other expense (22) (30) (12)
Consumers Energy Company | Nonrelated Party      
Other Income and Expenses [Line Items]      
Interest income 22 42 25
Consumers Energy Company | Related Party      
Other Income and Expenses [Line Items]      
Interest income $ 4 $ 5 $ 5