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Loans and finance receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Receivables [Abstract]        
Loans and finance receivables before allowances and discounts $ 31,450 $ 29,700    
Allowances for credit losses (1,323) (1,134) $ (1,051) $ (950)
Unamortized acquisition discounts and points (800) (768)    
Loans and finance receivables $ 29,327 $ 27,798