v3.20.1
Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 1,653 $ 1,428
Work in process 494 362
Finished goods 1,961 1,356
Service parts 386 406
Total $ 4,494 $ 3,552