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Leases (Schedule of Lease Cost) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Lessee, Lease, Description [Line Items]    
Operating lease costs $ 6 $ 6
Finance lease costs    
Amortization of right-of-use assets 9 12
Interest on lease liabilities 15 14
Variable lease costs 107 93
Short-term lease costs 14 23
Total lease costs 151 148
Consumers Energy Company    
Lessee, Lease, Description [Line Items]    
Operating lease costs 5 6
Finance lease costs    
Amortization of right-of-use assets 8 12
Interest on lease liabilities 13 14
Variable lease costs 107 93
Short-term lease costs 14 22
Total lease costs $ 147 $ 147