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Business Segments - Assets by Segment (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Total $ 1,807,982 $ 1,785,009 $ 1,675,972
Global Banking & Markets      
Segment Reporting Information [Line Items]      
Total 1,535,623   1,420,142
Asset & Wealth Management      
Segment Reporting Information [Line Items]      
Total 206,929   193,328
Platform Solutions      
Segment Reporting Information [Line Items]      
Total $ 65,430   $ 62,502