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Leases - Lessor Leases Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Power Sales Agreement      
Lessor, Lease, Description [Line Items]      
Leasing income   $ 42 $ 90
Variable lease income   $ 29 $ 63
Power Sales Agreement | Minimum      
Lessor, Lease, Description [Line Items]      
Operating leases remaining term 3 years    
Power Sales Agreement | Maximum      
Lessor, Lease, Description [Line Items]      
Operating leases remaining term 24 years    
Natural Gas Processing Plant | Consumers Energy Company      
Lessor, Lease, Description [Line Items]      
Direct financing lease term 20 years 20 years 20 years
CMS Energy Subsidiary | Natural Gas Transportation Agreement | Consumers Energy Company      
Lessor, Lease, Description [Line Items]      
Direct financing lease term 20 years 20 years 20 years