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Securities Financing Activities - Repurchase Agreement (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Offsetting Liabilities [Line Items]    
Short-term borrowings $ 26,885 $ 27,839
Securities sold under agreements to repurchase    
Offsetting Liabilities [Line Items]    
Short-term borrowings 5,871 3,103
Securities sold under agreements to repurchase | U.S. Treasury    
Offsetting Liabilities [Line Items]    
Short-term borrowings 71 78
Securities sold under agreements to repurchase | State and Municipal    
Offsetting Liabilities [Line Items]    
Short-term borrowings 42 100
Securities sold under agreements to repurchase | Agency MBS – residential    
Offsetting Liabilities [Line Items]    
Short-term borrowings 1,150 298
Securities sold under agreements to repurchase | Corporate and other debt securities    
Offsetting Liabilities [Line Items]    
Short-term borrowings 4,608 2,627
Securities sold under agreements to repurchase | Overnight and Continuous    
Offsetting Liabilities [Line Items]    
Short-term borrowings 421 478
Securities sold under agreements to repurchase | Overnight and Continuous | U.S. Treasury    
Offsetting Liabilities [Line Items]    
Short-term borrowings 71 78
Securities sold under agreements to repurchase | Overnight and Continuous | State and Municipal    
Offsetting Liabilities [Line Items]    
Short-term borrowings 42 100
Securities sold under agreements to repurchase | Overnight and Continuous | Agency MBS – residential    
Offsetting Liabilities [Line Items]    
Short-term borrowings 0 0
Securities sold under agreements to repurchase | Overnight and Continuous | Corporate and other debt securities    
Offsetting Liabilities [Line Items]    
Short-term borrowings 308 300
Securities sold under agreements to repurchase | Up to 30 days    
Offsetting Liabilities [Line Items]    
Short-term borrowings 5,450 2,625
Securities sold under agreements to repurchase | Up to 30 days | U.S. Treasury    
Offsetting Liabilities [Line Items]    
Short-term borrowings 0 0
Securities sold under agreements to repurchase | Up to 30 days | State and Municipal    
Offsetting Liabilities [Line Items]    
Short-term borrowings 0 0
Securities sold under agreements to repurchase | Up to 30 days | Agency MBS – residential    
Offsetting Liabilities [Line Items]    
Short-term borrowings 1,150 298
Securities sold under agreements to repurchase | Up to 30 days | Corporate and other debt securities    
Offsetting Liabilities [Line Items]    
Short-term borrowings $ 4,300 $ 2,327