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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenues	$ 23,350	$ 21,454	$ 71,606	$ 57,144
Automotive sales
Disaggregation Of Revenue [Line Items]
Revenues	18,582	17,785	57,879	46,969
Automotive regulatory credits
Disaggregation Of Revenue [Line Items]
Revenues	554	286	1,357	1,309
Energy generation and storage sales
Disaggregation Of Revenue [Line Items]
Revenues	1,416	966	4,188	2,186
Services and other
Disaggregation Of Revenue [Line Items]
Revenues	2,166	1,645	6,153	4,390
Total revenues from sales and services
Disaggregation Of Revenue [Line Items]
Revenues	22,718	20,682	69,577	54,854
Automotive leasing
Disaggregation Of Revenue [Line Items]
Revenues	489	621	1,620	1,877
Energy generation and storage leasing
Disaggregation Of Revenue [Line Items]
Revenues	$ 143	$ 151	$ 409	$ 413