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Leases - Assets and Liabilities of Lessee (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Operating leases    
Right-of-use assets $ 51  
Lease liabilities    
Current lease liabilities 10  
Noncurrent lease liabilities 41  
Finance leases    
Right-of-use assets 76  
Lease liabilities    
Current lease liabilities 7  
Non-current lease liabilities $ 63  
Weighted-average remaining lease term (in years)    
Operating leases 16 years  
Finance leases 12 years  
Weighted-average discount rate    
Operating leases 3.70%  
Finance leases 2.00%  
Related party lease liability $ 9 $ 10
Consumers Energy Company    
Operating leases    
Right-of-use assets 44  
Lease liabilities    
Current lease liabilities 8  
Noncurrent lease liabilities 35  
Finance leases    
Right-of-use assets 76  
Lease liabilities    
Current lease liabilities 7  
Non-current lease liabilities $ 63  
Weighted-average remaining lease term (in years)    
Operating leases 13 years  
Finance leases 12 years  
Weighted-average discount rate    
Operating leases 3.70%  
Finance leases 2.00%  
Related party lease liability $ 16 $ 14
Related Party Lease    
Weighted-average discount rate    
Related party lease liability 25  
Related party lease liability 1  
Related Party Lease | Consumers Energy Company    
Weighted-average discount rate    
Related party lease liability 25  
Related party lease liability $ 1