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Leases and Palisades Financing - Palisades Financing (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
MW
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2007
Finance Obligation        
2021 $ 1,486      
2022 608      
Total minimum payments 15,272 $ 13,188    
Less discount 33 27    
Less current portion 1,486 1,111    
Non-current portion 13,634 11,951    
Consumers Energy Company        
Finance Obligation        
2021 364      
2022 28      
Total minimum payments 8,197 7,322    
Less discount 29 23    
Less current portion 364 202    
Non-current portion $ 7,742 7,048    
Financing Obligation | Consumers Energy Company | Palisades Power Purchase Agreement        
Other Commitments [Line Items]        
Finance obligation term       15 years
Annual average capacity (in MW) | MW 798      
Amortization and interest expense $ 14 $ 15 $ 16  
Palisades asset 16      
Palisades financing obligation 16      
Finance Obligation        
2021 14      
2022 3      
Total minimum payments 17      
Less discount 1      
Financing obligation 16      
Less current portion 13      
Non-current portion $ 3