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Contingencies and Commitments (Contingencies And Commitments) (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 24 Months Ended
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2022
USD ($)
site
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
site
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Loss Contingencies [Line Items]                
Regulatory assets       $ 3,427   $ 3,427   $ 2,259
Consumers Energy Company                
Loss Contingencies [Line Items]                
Regulatory assets       3,427   3,427   2,259
Cost of gas sold       $ 114 $ 53 $ 792 $ 425  
Consumers Energy Company | Ludington                
Loss Contingencies [Line Items]                
Ownership share       51.00%   51.00%    
Consumers Energy Company | Ludington Plant Overhaul Contract Dispute                
Loss Contingencies [Line Items]                
Damages sought   $ 15            
Consumers Energy Company | J.H. Campbell 3 Plant Retirement Contract Dispute                
Loss Contingencies [Line Items]                
Damages sought $ 37              
Consumers Energy Company | Manufactured Gas Plant                
Loss Contingencies [Line Items]                
Regulatory assets       $ 111   $ 111    
Bay Harbor                
Loss Contingencies [Line Items]                
Accrual for environmental loss contingencies       $ 44   $ 44    
Discounted projected costs rate       4.34%   4.34%    
Accrual for environmental loss contingencies, inflation rate       1.00%   1.00%    
Remaining undiscounted obligation amount       $ 54   $ 54    
CERCLA Liability | Consumers Energy Company                
Loss Contingencies [Line Items]                
Accrual for environmental loss contingencies       3   3    
CERCLA Liability | Minimum | Consumers Energy Company                
Loss Contingencies [Line Items]                
Remediation and other response activity costs       3   3    
CERCLA Liability | Maximum | Consumers Energy Company                
Loss Contingencies [Line Items]                
Remediation and other response activity costs       8   8    
Manufactured Gas Plant | Consumers Energy Company                
Loss Contingencies [Line Items]                
Accrual for environmental loss contingencies       $ 63   $ 63    
Discounted projected costs rate       2.57%   2.57%    
Accrual for environmental loss contingencies, inflation rate       2.50%   2.50%    
Remaining undiscounted obligation amount       $ 67   $ 67    
Number of former MGPs | site       23   23    
Regulatory asset collection period           10 years    
Electric Utility | NREPA | Consumers Energy Company                
Loss Contingencies [Line Items]                
Accrual for environmental loss contingencies       $ 2   $ 2    
Electric Utility | NREPA | Minimum | Consumers Energy Company                
Loss Contingencies [Line Items]                
Remediation and other response activity costs       2   2    
Electric Utility | NREPA | Maximum | Consumers Energy Company                
Loss Contingencies [Line Items]                
Remediation and other response activity costs       4   4    
Gas Utility | NREPA | Consumers Energy Company                
Loss Contingencies [Line Items]                
Accrual for environmental loss contingencies       1   1    
Gas Utility | NREPA | Maximum | Consumers Energy Company                
Loss Contingencies [Line Items]                
Remediation and other response activity costs       $ 3   3    
Ray Compressor Station | Consumers Energy Company                
Loss Contingencies [Line Items]                
Plant additions               $ 17
Insurance recoveries received           13    
Impairment charge           $ 10    
Ray Compressor Station | Consumers Energy Company | GCR underrecoveries                
Loss Contingencies [Line Items]                
Cost of gas sold     $ 7