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Leases and Palisades Financing - Lessor Leases Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]    
Minimum rental payments to be received 2027 and thereafter $ 6  
Lease receivables 5  
Unearned income 4  
Maximum    
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]    
Minimum rental payments to be received 2022 1  
Minimum annual rental payments to be received in 2023 1  
Minimum annual rental payments to be received in 2024 1  
Minimum annual rental payments to be received in 2025 1  
Minimum rental payments to be received in 2026 1  
Consumers Energy Company    
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]    
Minimum rental payments to be received 2022 1  
Minimum annual rental payments to be received in 2023 1  
Minimum annual rental payments to be received in 2024 1  
Minimum annual rental payments to be received in 2025 1  
Minimum rental payments to be received in 2026 1  
Minimum rental payments to be received 2027 and thereafter 17  
Lease receivables 10  
Unearned income 12  
Power Sales Agreement    
Lessor, Lease, Description [Line Items]    
Leasing income 194 $ 148
Variable lease income $ 138 $ 93