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Fair Value Option - Summary of DVA Gains/(Losses) on Financial Liabilities (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]        
After-tax DVA $ (711) $ (95) $ (641) $ (383)
Other Financial Liabilities        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Pre-tax DVA (962) (128) (864) (514)
After-tax DVA $ (711) $ (95) $ (641) $ (383)