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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for uncollectible accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 27 $ 20 $ 29
Charged to Expense 34 50 22
Charged to Other Accounts 0 0 0
Deductions 40 43 31
Balance at End of Period 21 27 20
Allowance for uncollectible accounts | Consumers Energy Company      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 27 20 29
Charged to Expense 34 50 22
Charged to Other Accounts 0 0 0
Deductions 40 43 31
Balance at End of Period 21 27 20
Deferred tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 2 2 1
Charged to Expense 0 0 1
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Period $ 2 $ 2 $ 2