Segment Reporting and Information about Geographic Areas - Schedule of Total Revenues and Gross Profit by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$ 8,771	$ 6,303	$ 20,792	$ 17,194
Gross profit	2,063	1,191	4,564	2,678
Automotive Segment [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	8,192	5,901	19,550	16,099
Gross profit	2,042	1,103	4,511	2,539
Energy Generation and Storage [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	579	402	1,242	1,095
Gross profit	$ 21	$ 88	$ 53	$ 139

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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