Segment Reporting and Information about Geographic Areas - Schedule of Total Revenues and Gross Profit by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$ 11,958	$ 6,036	$ 22,347	$ 12,021
Gross profit	2,884	1,267	5,099	2,501
Automotive Segment [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	11,157	5,666	21,052	11,358
Gross profit	2,864	1,246	5,180	2,469
Energy Generation and Storage [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	801	370	1,295	663
Gross profit	$ 20	$ 21	$ (81)	$ 32