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Leases - Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease expense $ 4 $ 4 $ 13 $ 12
Finance lease expense:        
Amortization of ROU 2 2 5 5
Interest expense on lease liability $ 1 $ 2 $ 4 $ 5