Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenues	$ 53,823	$ 31,536	$ 24,578
Automotive Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,465	1,580	594
Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,802	2,306	2,226
Sales and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	51,671	29,967	23,178
Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,642	1,052	869
Automotive [Member] | Automotive Sales without Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Revenues	43,186	24,053	19,212
Automotive [Member] | Automotive Sales with Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Revenues	939	551	146
Automotive [Member] | Automotive Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,465	1,580	594
Automotive [Member] | Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,642	1,052	869
Energy Generation and Storage [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	2,789	1,994	1,531
Energy Generation and Storage [Member] | Energy Generation and Storage Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenues	2,279	1,477	1,000
Energy Generation and Storage [Member] | Energy Generation and Storage Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 510	$ 517	$ 531