v3.25.1
Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation Of Revenue [Line Items]    
Revenues $ 19,335 $ 21,301
Total revenues from sales and services    
Disaggregation Of Revenue [Line Items]    
Revenues 18,779 20,712
Automotive sales    
Disaggregation Of Revenue [Line Items]    
Revenues 12,925 16,460
Automotive regulatory credits    
Disaggregation Of Revenue [Line Items]    
Revenues 595 442
Energy generation and storage sales    
Disaggregation Of Revenue [Line Items]    
Revenues 2,621 1,522
Services and other    
Disaggregation Of Revenue [Line Items]    
Revenues 2,638 2,288
Automotive leasing    
Disaggregation Of Revenue [Line Items]    
Revenues 447 476
Energy generation and storage leasing    
Disaggregation Of Revenue [Line Items]    
Revenues $ 109 $ 113