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Leases and Palisades Financing - Lessor Leases Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]  
Minimum rental payments to be received 2025 and thereafter $ 10
Unearned income 5
Lease receivables 5
Maximum  
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]  
Minimum rental payments to be received 2020 1
Minimum annual rental payments to be received in 2021 1
Minimum annual rental payments to be received in 2022 1
Minimum annual rental payments to be received in 2023 1
Minimum rental payments to be received in 2024 1
Consumers Energy Company  
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]  
Minimum rental payments to be received 2020 1
Minimum annual rental payments to be received in 2021 1
Minimum annual rental payments to be received in 2022 1
Minimum annual rental payments to be received in 2023 1
Minimum rental payments to be received in 2024 1
Minimum rental payments to be received 2025 and thereafter 19
Unearned income 14
Lease receivables 10
Power Sales Agreement  
Lessor, Lease, Description [Line Items]  
Leasing income 174
Variable lease income $ 119
CMS Energy Subsidiary | Natural Gas Transportation Agreement | Consumers Energy Company  
Lessor, Lease, Description [Line Items]  
Direct financing lease term 20 years