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Collateralized Agreements and Financings - Schedule of Repurchase Agreements and Securities Loaned by Maturity Date (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Offsetting Liabilities [Line Items]    
Repurchase agreements $ 467,035 $ 408,242
Securities loaned 76,416 $ 66,674
No stated maturity and overnight    
Offsetting Liabilities [Line Items]    
Repurchase agreements 259,127  
Securities loaned 46,016  
2 - 30 days    
Offsetting Liabilities [Line Items]    
Repurchase agreements 87,805  
Securities loaned 1,813  
30-89 days    
Offsetting Liabilities [Line Items]    
Repurchase agreements 47,993  
Securities loaned 2,191  
91 days - 1 year    
Offsetting Liabilities [Line Items]    
Repurchase agreements 46,227  
Securities loaned 14,541  
Greater than 1 year    
Offsetting Liabilities [Line Items]    
Repurchase agreements 25,883  
Securities loaned $ 11,855