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Reportable Segments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Operating Revenue $ 1,920 $ 1,558 $ 4,294 $ 3,571  
Net income (loss) available to common stockholders 145 176 496 525  
Plant, property, and equipment, gross 29,426   29,426   $ 29,893
Total assets 29,040   29,040   28,753
Consumers Energy Company          
Segment Reporting Information [Line Items]          
Operating Revenue 1,802 1,493 4,085 3,430  
Net income (loss) available to common stockholders 172 189 555 525  
Plant, property, and equipment, gross 28,304   28,304   28,771
Total assets 27,715   27,715   27,140
Other reconciling items          
Segment Reporting Information [Line Items]          
Net income (loss) available to common stockholders (38) (19) (78) (20)  
Plant, property, and equipment, gross 25   25   23
Total assets 68   68   431
Other reconciling items | Consumers Energy Company          
Segment Reporting Information [Line Items]          
Net income (loss) available to common stockholders (4) (1) (4) (1)  
Plant, property, and equipment, gross 25   25   23
Total assets 22   22   21
Electric Utility | Operating Segments          
Segment Reporting Information [Line Items]          
Operating Revenue 1,325 1,160 2,566 2,294  
Net income (loss) available to common stockholders 140 154 307 309  
Plant, property, and equipment, gross 17,333   17,333   18,147
Total assets 16,860   16,860   16,493
Electric Utility | Operating Segments | Consumers Energy Company          
Segment Reporting Information [Line Items]          
Operating Revenue 1,325 1,160 2,566 2,294  
Net income (loss) available to common stockholders 140 154 307 309  
Plant, property, and equipment, gross 17,333   17,333   18,147
Total assets 16,922   16,922   16,555
Gas Utility | Operating Segments          
Segment Reporting Information [Line Items]          
Operating Revenue 477 333 1,519 1,136  
Net income (loss) available to common stockholders 36 36 252 217  
Plant, property, and equipment, gross 10,946   10,946   10,601
Total assets 10,725   10,725   10,517
Gas Utility | Operating Segments | Consumers Energy Company          
Segment Reporting Information [Line Items]          
Operating Revenue 477 333 1,519 1,136  
Net income (loss) available to common stockholders 36 36 252 217  
Plant, property, and equipment, gross 10,946   10,946   10,601
Total assets 10,771   10,771   10,564
Enterprises | Operating Segments          
Segment Reporting Information [Line Items]          
Operating Revenue 118 65 209 141  
Net income (loss) available to common stockholders 7 $ 5 15 $ 19  
Plant, property, and equipment, gross 1,122   1,122   1,122
Total assets $ 1,387   $ 1,387   $ 1,312