v3.25.3
Line of Business Information - Components of Other (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Foreign exchange trading services $ 416 $ 374   $ 1,209 $ 1,041
Client rescoping (revenue impact)       (24)  
Other fee revenue 79 125   177 223
Gains (losses) from sales of available-for-sale securities, net 1 (80)   1 (80)
Repositioning charges       (100)  
Client rescoping (expense impact)       (18)  
FDIC special assessment     $ (130)    
Income before income tax expense 1,102 925   2,813 2,435
Client rescoping (revenue impact) before taxes       42  
Client rescoping (revenue impact)       24  
Client rescoping (expense impact)       18  
Loss on the sale of investment securities (1) 80   (1) 80
Repositioning charges       100  
FDIC special assessment expense     $ 130    
Other          
Segment Reporting Information [Line Items]          
Foreign exchange trading services 0 15   3 15
Client rescoping (revenue impact) 0 0   (24) 0
Other fee revenue 0 66   0 66
Gains (losses) from sales of available-for-sale securities, net 0 (81)   0 (81)
Repositioning charges 0 0   (100) 0
Client rescoping (expense impact) 0 0   (18) 0
FDIC special assessment 0 0   0 (130)
Other 0 0   1 (1)
Income before income tax expense 0 0   (138) (131)
Client rescoping (revenue impact) 0 0   24 0
Client rescoping (expense impact) 0 0   18 0
Loss on the sale of investment securities 0 81   0 81
Repositioning charges 0 0   100 0
FDIC special assessment expense $ 0 $ 0   $ 0 $ 130