Other Long-Term Liabilities - Schedule of Other Long-term Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Other Liabilities Noncurrent [Abstract]
Accrued warranty reserve	$ 869	$ 745
Financing obligation	30	37
Sales return reserve	519	545
Resale value guarantees	36	36
Operating lease liabilities	1,101	956
Other non-current liabilities	494	372
Total other long-term liabilities	$ 3,049	$ 2,691