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Leases - Schedule of Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 38 $ 83
Short-term lease cost 0 2
Variable lease cost 6 16
Sublease income 0 0
Total lease cost $ 44 $ 101