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Leases - Lease Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 32 $ 95
Short-term lease cost 11 32
Other (1)  
Total lease cost $ 42 $ 127