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Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]    
Total current regulatory assets $ 203 $ 57
Total non-current regulatory assets 3,683 3,595
Total current regulatory liabilities 56 104
Total non-current regulatory liabilities 3,894 3,796
Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory assets 203 57
Total non-current regulatory assets 3,683 3,595
Total regulatory assets 3,886 3,652
Total current regulatory liabilities 56 104
Total non-current regulatory liabilities 3,894 3,796
Total regulatory liabilities 3,950 3,900
Income taxes, net | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory liabilities 49 48
Total non-current regulatory liabilities 1,220 1,267
Reserve for customer refunds | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory liabilities 2 47
Total regulatory liabilities 15  
Other | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory liabilities 5 9
Total non-current regulatory liabilities 20 20
Cost of removal | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory liabilities 2,545 2,426
Renewable energy grant | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory liabilities 43 45
Renewable energy plan | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory liabilities 29 32
Energy waste reduction plan | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory liabilities 25 6
Postretirement benefits expense deferral mechanism | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory liabilities 12 0
2022 PSCR underrecovery | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory assets 126 0
Total non-current regulatory assets 126 0
Energy Waste Reduction Plan Incentive | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory assets 54 47
Total non-current regulatory assets   55
Retention incentive program | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory assets 12 2
Total non-current regulatory assets 27 31
Other | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total current regulatory assets 11 8
Total non-current regulatory assets 26 29
Costs of coal-fueled electric generating units to be retired | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 1,265 1,258
Securitized costs | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 778 843
Postretirement benefits | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 741 856
ARO | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 328 281
MGP sites | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 99 108
Unamortized loss on reacquired debt | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 96 100
Decommissioning costs | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 83 24
Postretirement benefits expense deferral mechanism | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 24 0
Ludington overhaul contract dispute | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets 13 0
Energy waste reduction plan | Consumers Energy Company    
Public Utilities, General Disclosures [Line Items]    
Total non-current regulatory assets $ 19 $ 10