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Contingencies And Commitments (Contingencies And Commitments) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
May 30, 2020
USD ($)
Jan. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
site
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
lawsuit
site
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
lawsuit
Mar. 31, 2020
USD ($)
Loss Contingencies [Line Items]                  
Regulatory assets       $ 2,485,000   $ 2,485,000   $ 2,489,000  
Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Regulatory assets       2,485,000   2,485,000   $ 2,489,000  
Cost of gas sold       80,000 $ 104,000 350,000 $ 505,000    
Bay Harbor                  
Loss Contingencies [Line Items]                  
Accrual for obligations for environmental remediation       $ 45,000   $ 45,000      
Discounted projected costs rate       4.34%   4.34%      
Accrual for environmental loss contingencies, inflation rate       1.00%   1.00%      
Remaining undiscounted obligation amount       $ 56,000   $ 56,000      
Electric Utility | NREPA | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Accrual for obligations for environmental remediation       3,000   3,000      
Electric Utility | NREPA | Minimum | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Remediation and other response activity costs       3,000   3,000      
Electric Utility | NREPA | Maximum | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Remediation and other response activity costs       4,000   4,000      
Electric Utility | CERCLA Liability | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Accrual for obligations for environmental remediation       3,000   3,000      
Electric Utility | CERCLA Liability | Minimum | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Remediation and other response activity costs       3,000   3,000      
Electric Utility | CERCLA Liability | Maximum | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Remediation and other response activity costs       8,000   8,000      
Gas Utility | NREPA | Maximum | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Accrual for obligations for environmental remediation       1,000   1,000      
Remediation and other response activity costs       3,000   3,000      
Gas Utility | Manufactured Gas Plant | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Accrual for obligations for environmental remediation       $ 63,000   $ 63,000      
Discounted projected costs rate       2.57%   2.57%      
Accrual for environmental loss contingencies, inflation rate       2.50%   2.50%      
Remaining undiscounted obligation amount       $ 67,000   $ 67,000      
Number of former MGPs | site       23   23      
Authorized recovery, collection period           10 years      
Regulatory assets       $ 126,000   $ 126,000      
Equatorial Guinea Tax Claim                  
Loss Contingencies [Line Items]                  
Foreign government tax claim on sale           $ 152,000      
Class Action Lawsuits                  
Loss Contingencies [Line Items]                  
Number of lawsuits | lawsuit           4      
Individual Lawsuits                  
Loss Contingencies [Line Items]                  
Number of lawsuits | lawsuit           1      
Gas Index Price Reporting Litigation                  
Loss Contingencies [Line Items]                  
Number of lawsuits | lawsuit               2  
Estimated litigation liability               $ 30,000  
MCV PPA | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Foreign government tax claim on sale     $ 270,000            
Underwater cables Straits of Mackinac | Minimum | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Asset retirement obligation                 $ 5,000
Civil Case, Consumers V. MPSC Staff [Member] | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Civil penalty settlement   $ 10              
Ray Compressor Station | Consumers Energy Company                  
Loss Contingencies [Line Items]                  
Cost of gas sold $ 7,000                
Capital expenditures           $ 12,000