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Leases (Schedule of Lessee Cash Flows) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities    
Cash used in operating activities for operating leases $ 6 $ 6
Cash used in operating activities for finance leases 15 14
Cash used in financing activities for finance leases 8 13
Lease liabilities arising from obtaining right-of-use assets    
Operating leases 1 10
Finance leases 0 36
Consumers Energy Company    
Cash paid for amounts included in the measurement of lease liabilities    
Cash used in operating activities for operating leases 6 6
Cash used in operating activities for finance leases 13 14
Cash used in financing activities for finance leases 8 12
Lease liabilities arising from obtaining right-of-use assets    
Operating leases 1 10
Finance leases $ 0 $ 12