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Leases Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress $ 17  
Operating Lease, Liability 26 $ 44
Operating Lease, Liability, Related to Power Purchase Agreements 161 25
Lessee, Operating Lease, Lease Not yet Commenced, Estimated Present Value of Future Lease Payments 30  
Operating Lease, Liability, Current 4 8
Operating Lease, Liability, Noncurrent 22 $ 36
Lessee, Operating Lease, Liability, Payments, Due 56  
Future estimated operating lease payments 32  
Future estimated operating lease liability, current $ 2