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Regulatory Matters - Quarterly Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jan. 31, 2022
Public Utilities, General Disclosures [Line Items]                
Operating Revenue     $ 2,024 $ 1,725 $ 6,318 $ 5,296    
Regulatory assets     3,427   3,427   $ 2,259  
Regulatory liabilities     3,862   3,862   3,802  
Consumers Energy Company                
Public Utilities, General Disclosures [Line Items]                
Operating Revenue     1,886 $ 1,644 5,971 $ 5,074    
Regulatory assets     3,427   3,427   2,259  
Regulatory liabilities     3,862   3,862   3,802  
Consumers Energy Company | Radio Tower Assets                
Public Utilities, General Disclosures [Line Items]                
Regulatory liabilities $ 7              
Consumers Energy Company | J.H. Campbell Generating Units                
Public Utilities, General Disclosures [Line Items]                
Rate of return on equity authorized 9.00%              
Regulatory assets $ 1,300              
Consumers Energy Company | Electric Rate Case                
Public Utilities, General Disclosures [Line Items]                
Estimate of disallowed costs     19   19      
Recommended disallowed costs               $ 11
Additional annual rate increase authorized   $ 5            
Consumers Energy Company | Energy Waste Reduction Plan Incentive                
Public Utilities, General Disclosures [Line Items]                
Requested recovery/collection     46   46      
Operating Revenue             $ 46  
Consumers Energy Company | GCR underrecoveries                
Public Utilities, General Disclosures [Line Items]                
Underrecovery for gas fuel and power supply costs     45   45      
Consumers Energy Company | PSCR underrecoveries                
Public Utilities, General Disclosures [Line Items]                
Underrecovery for gas fuel and power supply costs     $ 375   $ 375