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Loans and finance receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Receivables [Abstract]        
Loans and finance receivables before allowances and discounts $ 29,700 $ 26,289    
Allowances for credit losses (1,134) (950) $ (856) $ (765)
Unamortized acquisition discounts and points (768) (658)    
Loans and finance receivables $ 27,798 $ 24,681