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Leases - Components of Lease Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Operating lease cost:    
Fixed payments and variable payments that depend on an index or rate $ 36 $ 78
Variable lease payments not included in the lease liability 2 4
Short-term lease cost 1 3
Total operating lease cost $ 39 $ 85