Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Leasing revenues	$ 268	$ 208	$ 507	$ 423
Total revenues	6,036	6,350	12,021	10,891
Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	487	605	1,047	1,098
Sales and Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	5,623	5,999	11,249	10,213
Automotive [Member] \| Automotive Sales without Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	4,423	4,919	8,790	8,602
Automotive [Member] \| Automotive Sales with Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	60	138	232	(252)
Automotive [Member] \| Automotive Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	428	111	782	327
Automotive [Member] \| Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues	268	208	507	423
Energy Generation and Storage [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	370	369	663	693
Energy Generation and Storage [Member] \| Energy Generation and Storage Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	225	226	398	438
Energy Generation and Storage [Member] \| Energy Generation and Storage Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues	$ 145	$ 143	$ 265	$ 255

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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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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