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Regulatory Matters - (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
May 31, 2024
Mar. 31, 2024
Sep. 30, 2023
May 31, 2023
Public Utilities, General Disclosures [Line Items]        
Settlement agreement penalty payment $ 1      
Minimum settlement returns to customers $ 3      
Electric Rate Case | Consumers Energy Company        
Public Utilities, General Disclosures [Line Items]        
Requested annual rate increase       $ 216
Requested annual rate increase, as a percent       10.25%
Amended requested annual rate increase     $ 169  
Additional annual rate increase authorized   $ 92    
Surcharge for the recovery of excess distribution investments   $ 9    
Rate of return on equity authorized   9.90%