Summary of Significant Accounting Policies - Schedule of Accrued Warranty Activity (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Standard Product Warranty Disclosure [Abstract]
Accrued warranty—beginning of period	$ 1,089	$ 748	$ 402
Warranty costs incurred	(312)	(250)	(209)
Net changes in liability for pre-existing warranties, including expirations and foreign exchange impact	66	36	(26)
Additional warranty accrued from adoption of ASC 606			37
Provision for warranty	625	555	544
Accrued warranty—end of period	$ 1,468	$ 1,089	$ 748