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Leases - Schedule of Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 42 $ 125
Short-term lease cost 0 2
Variable lease cost 5 21
Sublease income 0 0
Total lease cost $ 47 $ 148