Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Total revenues	$ 23,329	$ 18,756
Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,837	1,279
Sales and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	22,649	17,975
Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	564	668
Automotive | Automotive Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenues	18,878	15,514
Automotive | Automotive Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Revenues	521	679
Energy Generation and Storage [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	21,800	18,140
Energy Generation and Storage [Member] | Energy Generation and Storage Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,413	503
Energy Generation and Storage [Member] | Energy Generation and Storage Leasing [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 116	$ 113