Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Leasing revenues	$ 239	$ 215
Total revenues	5,985	4,541
Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	560	493
Sales and Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	5,626	4,214
Automotive [Member] \| Automotive Sales without Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	4,367	3,683
Automotive [Member] \| Automotive Sales with Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	172	(390)
Automotive [Member] \| Automotive Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	354	216
Automotive [Member] \| Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues	239	215
Energy Generation and Storage [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	293	324
Energy Generation and Storage [Member] \| Energy Generation and Storage Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from sales and services	173	212
Energy Generation and Storage [Member] \| Energy Generation and Storage Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues	$ 120	$ 112

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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, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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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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