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Business Segments - Depreciation and Amortization (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total $ 531 $ 621 $ 1,655 $ 1,894
Global Banking & Markets        
Segment Reporting Information [Line Items]        
Total 270 276 822 854
Asset & Wealth Management        
Segment Reporting Information [Line Items]        
Total 215 216 694 825
Platform Solutions        
Segment Reporting Information [Line Items]        
Total $ 46 $ 129 $ 139 $ 215