Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenues	$ 21,454	$ 13,757	$ 57,144	$ 36,104
Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,645	894	4,390	2,738
Sales and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	20,682	13,228	54,854	34,687
Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	621	385	1,877	1,014
Automotive [Member] \| Automotive Sales without Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Revenues	17,624	11,230	46,467	28,575
Automotive [Member] \| Automotive Sales with Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Revenues	161	163	502	525
Automotive [Member] \| Automotive Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Revenues	286	279	1,309	1,151
Energy Generation and Storage [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	1,117	806	2,599	2,101
Energy Generation and Storage [Member] \| Energy Generation and Storage Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenues	966	662	2,186	1,698
Energy Generation and Storage [Member] \| Energy Generation and Storage Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 151	$ 144	$ 413	$ 403