v3.25.4
Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating Expenses      
Other operating expenses $ (1,727) $ (1,638) $ (1,687)
Total operating expenses (6,812) (6,028) (6,227)
Operating Loss 1,727 1,487 1,235
Other Income (Expense)      
Equity earnings of subsidiaries 5 7 7
Non-operating retirement benefits, net 186 169 180
Other expense (27) (32) (13)
Total other income 310 344 362
Interest Charges      
Interest on long-term debt 798 700 616
Total interest charges 789 708 643
Income (Loss) Before Income Taxes 1,248 1,123 954
Income Tax Expense 246 176 147
Net Income 1,071 1,003 887
Preferred Stock Dividends 10 10 10
Net Income (Loss) Available to Common Stockholders 1,061 993 877
Related Party      
Interest Charges      
Intercompany interest expense and other 11 12 12
CMS Energy      
Operating Expenses      
Other operating expenses 9 10 10
Total operating expenses 9 10 10
Operating Loss (9) (10) (10)
Other Income (Expense)      
Non-operating retirement benefits, net (1) (1) (1)
Other income 69 45 31
Other expense (2) 0 0
Total other income 1,255 1,105 959
Interest Charges      
Interest on long-term debt 266 205 201
Total interest charges 276 215 211
Income (Loss) Before Income Taxes 970 880 738
Income Tax Expense (39) (19) (20)
Net Income 1,009 899 758
Preferred Stock Dividends 10 10 10
Net Income (Loss) Available to Common Stockholders 999 889 748
CMS Energy | Related Party      
Other Income (Expense)      
Equity earnings of subsidiaries 1,189 1,061 929
Interest Charges      
Intercompany interest expense and other $ 10 $ 10 $ 10