Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenues	$ 97,690	$ 96,773	$ 81,462
Total revenues from sales and services
Disaggregation Of Revenue [Line Items]
Revenues	95,341	94,133	78,453
Automotive sales
Disaggregation Of Revenue [Line Items]
Revenues	72,480	78,509	67,210
Automotive regulatory credits
Disaggregation Of Revenue [Line Items]
Revenues	2,763	1,790	1,776
Energy generation and storage sales
Disaggregation Of Revenue [Line Items]
Revenues	9,564	5,515	3,376
Services and other
Disaggregation Of Revenue [Line Items]
Revenues	10,534	8,319	6,091
Automotive leasing
Disaggregation Of Revenue [Line Items]
Revenues	1,827	2,120	2,476
Energy generation and storage leasing
Disaggregation Of Revenue [Line Items]
Revenues	$ 522	$ 520	$ 533