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Leases - Schedule of Company's right-of-use asset (Detail) - 9 months ended Sep. 30, 2019
$ in Millions, $ in Millions
USD ($)
MXN ($)
Presentation of leases for lessee [abstract]    
Cost   $ 1,797
Additions   54
Disposals   (15)
Depreciation   (388)
Effects of changes in foreign exchange rates   (90)
Cost $ 69 $ 1,358