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Inventories - Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 1,254 $ 1,007
Work-in-process 331 264
Finished goods 433 327
Tooling and engineering 1,361 1,206
Inventory, net, total $ 3,379 $ 2,804