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GM Financial Receivables and Transactions - Finance Receivables (Details) - GM Financial - USD ($)
$ in Millions
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Finance Receivables [Line Items]            
GM Financial receivables $ 94,326   $ 92,374      
Less: allowance for loan losses (2,895) $ (2,866) (2,725) $ (2,736) $ (2,720) $ (2,458)
GM Financial receivables, net 91,431   89,650      
Level 2            
Finance Receivables [Line Items]            
Fair value of GM Financial receivables 17,606   16,902      
Level 3            
Finance Receivables [Line Items]            
Fair value of GM Financial receivables 73,981   74,409      
Retail            
Finance Receivables [Line Items]            
GM Financial receivables 76,651   75,404 $ 75,857    
Less: allowance for loan losses (2,826)   (2,656)      
GM Financial receivables, net 73,825   72,748      
Commercial            
Finance Receivables [Line Items]            
GM Financial receivables 17,675   16,970      
Less: allowance for loan losses (69)   (68)      
GM Financial receivables, net 17,606   16,902      
Dealer cash management balance 3,600   3,400      
Commercial | Dealer Financing            
Finance Receivables [Line Items]            
GM Financial receivables 17,225   16,374      
Commercial | Other Financing            
Finance Receivables [Line Items]            
GM Financial receivables $ 450   $ 596