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Leases And Palisades Financing (Schedule of Future Minimum Lease Payments for Leases) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Leases [Line Items]    
Capital and Financing Leases, Non-current portion $ 110 $ 118
Consumers Energy Company [Member]    
Leases [Line Items]    
Capital and Financing Leases, Non-current portion 110 $ 118
Operating Leases, 2017 20  
Operating Leases, 2018 16  
Operating Leases, 2019 10  
Operating Leases, 2020 10  
Operating Leases, 2021 10  
Operating Leases, 2022 and thereafter 15  
Operating Leases, Total minimum lease payments 81  
Consumers Energy Company [Member] | Capital Leases [Member]    
Leases [Line Items]    
Capital and Financing Leases, 2017 15  
Capital and Financing Leases, 2018 14  
Capital and Financing Leases, 2019 14  
Capital and Financing Leases, 2020 12  
Capital and Financing Leases, 2021 11  
Capital and Financing Leases, 2022 and thereafter 25  
Capital and Financing Leases, Total minimum lease payments 91  
Capital and Financing Leases, Less imputed interest 28  
Capital and Financing Leases, Present value of net minimum lease payments 63  
Capital and Financing Leases, Less current portion 9  
Capital and Financing Leases, Non-current portion 54  
Consumers Energy Company [Member] | Financing Leases [Member]    
Leases [Line Items]    
Capital and Financing Leases, 2017 17  
Capital and Financing Leases, 2018 16  
Capital and Financing Leases, 2019 15  
Capital and Financing Leases, 2020 14  
Capital and Financing Leases, 2021 14  
Capital and Financing Leases, 2022 and thereafter 3  
Capital and Financing Leases, Total minimum lease payments 79  
Capital and Financing Leases, Less imputed interest 10  
Capital and Financing Leases, Present value of net minimum lease payments 69  
Capital and Financing Leases, Less current portion 13  
Capital and Financing Leases, Non-current portion $ 56