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Leases - Lease Cost (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 cost - Fixed $ 5 $ 2 $ 14 $ 6
Operating lease cost - Variable 2 3 7 10
Total lease cost $ 7 $ 5 $ 21 $ 16