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Fair Value Option - Gains and Losses on Other Financial Assets and Financial Liabilities at Fair Value (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair value option gains/(losses) $ (4,787) $ (5,310) $ (11,016) $ (7,783)
Unsecured short-term borrowings        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair value option gains/(losses) (2,027) (1,287) (3,839) (2,477)
Unsecured long-term borrowings        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair value option gains/(losses) (2,476) (3,707) (6,412) (4,781)
Other        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair value option gains/(losses) $ (284) $ (316) $ (765) $ (525)