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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenues	$ 16,934	$ 11,958	$ 35,690	$ 22,347
Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,466	951	2,745	1,844
Sales and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	16,197	11,478	34,172	21,459
Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	588	332	1,256	629
Automotive [Member] | Automotive Sales without Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Revenues	13,518	9,332	28,843	17,345
Automotive [Member] | Automotive Sales with Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Revenues	152	188	341	362
Automotive [Member] | Automotive Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Revenues	344	354	1,023	872
Energy Generation and Storage [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	866	801	1,482	1,295
Energy Generation and Storage [Member] | Energy Generation and Storage Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenues	717	653	1,220	1,036
Energy Generation and Storage [Member] | Energy Generation and Storage Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 149	$ 148	$ 262	$ 259