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Leases Maturities of Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Lessee, Operating Lease, Liability, Payments, Due Year Two $ 4  
Lessee, Operating Lease, Liability, Payments, Due Year Three 3  
Lessee, Operating Lease, Liability, Payments, Due Year Four 1  
Lessee, Operating Lease, Liability, Payments, Due Year Five 1  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 43  
Lessee, Operating Lease, Liability, Payments, Due 56  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (30)  
Operating Lease, Liability 26 $ 44
Finance Lease, Liability, Payments, Due Year One 20  
Finance Lease, Liability, Payments, Due Year Two 18  
Finance Lease, Liability, Payments, Due Year Three 18  
Finance Lease, Liability, Payments, Due Year Four 25  
Finance Lease, Liability, Payments, Due Year Five 25  
Finance Lease, Liability, Payments, Due after Year Five 377  
Finance Lease, Liability, Payment, Due 483  
Finance Lease, Liability, Undiscounted Excess Amount (190)  
Finance Lease, Liability 293 $ 145
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 4