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Leases - Lessor Leases Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
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 8  
Lease receivables 6  
Unearned income 7  
Power Sales Agreement    
Lessor, Lease, Description [Line Items]    
Leasing income 240 $ 194
Variable lease income $ 191 $ 138