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Inventories - Summary of inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Classes Of Inventories [Abstract]    
Raw materials and purchased components $ 734 $ 648
Consumable stores 862 875
Work in progress 1,026 1,082
Finished goods and goods for resale 977 1,027
Total inventories 3,599 3,632
Expected to be used within one year 3,447 3,472
Expected to be used after more than one year $ 152 $ 160