v3.20.4
Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 1,508 $ 1,428
Work in process 493 362
Finished goods 1,666 1,356
Service parts 434 406
Total $ 4,101 $ 3,552