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Other Assets - Carrying Value of Goodwill (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill $ 5,950 $ 5,853
Investment banking    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill 267 267
FICC    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill 269 269
Equities    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill 2,647 2,647
Asset management    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill 1,458 1,361
Wealth management    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill $ 1,309 $ 1,309