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Revenue (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Uncollectable expense $ 8 $ 6 $ 13 $ 12  
Regulatory assets 2,485   2,485   $ 2,489
Consumers Energy Company          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Regulatory assets 2,485   2,485   2,489
Unbilled receivables 326   326   $ 426
COVID-19 Costs Accounting Deferral | Consumers Energy Company          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Regulatory assets $ 9   $ 9