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Plant, Property, and Equipment (Schedule of Finance Leases and Other Financing Obligations) (Details) - Consumers Energy Company - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finance Leases and Other Financing Obligations, Rollforward [Roll Forward]    
Balance at beginning of period $ 309 $ 312
Additions 26 0
Net retirements and other adjustments 5 (3)
Balance at end of period 340 309
Less accumulated depreciation and amortization $ 239 $ 212