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Leases Leases, Cash Flow Presentation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash Flow of Leases [Abstract]    
Operating Lease, Payments $ 19 $ 19
Finance Lease, Interest Payment on Liability 0 0
Finance Lease, Principal Payments 2 1
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 5 8
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 1 $ 5