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Lease, Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Lease cost $ 41 $ 120
Variable lease cost [1] 30 102
Total lease cost $ 71 $ 222
[1]
(a)    Includes short-term leases, which are immaterial.