v3.25.4
Derivatives and Hedging Activities - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative [Line Items]      
Derivative unrealized gains and losses, location Market making, Other principal transactions Market making, Other principal transactions  
Foreign currency denominated debt designated as hedges $ 22,890,000,000 $ 22,100,000,000  
AOCI, cash flow hedge reclassification 0    
Gains (losses) in other comprehensive income (loss), cash flow hedges 0    
Cash flow hedge expected to be reclassified within 12 months $ 0    
Derivatives      
Derivative [Line Items]      
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Trading Assets Including Pledge    
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Trading Assets Including Pledge    
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Trading liabilities    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Trading liabilities    
Net Investment Hedging      
Derivative [Line Items]      
Gain (loss) on hedged item $ 0 0 $ 139,000,000
Change in unrealized gain (loss) on fair value hedges 0 0 90,000,000
Amount reclassified to earnings from accumulated other comprehensive income/(loss) $ 0 $ 0 $ (49,000,000)
Other principal transactions      
Derivative [Line Items]      
Derivative gains and losses, location Market making, Other principal transactions Market making, Other principal transactions  
Market making      
Derivative [Line Items]      
Derivative gains and losses, location Market making, Other principal transactions Market making, Other principal transactions  
Accounted for as hedges      
Derivative [Line Items]      
Amortized cost $ 42,440,000,000 $ 35,290,000,000  
Unsecured long-term borrowings | Accounted for as hedges      
Derivative [Line Items]      
Cumulative hedging adjustment (4,610,000,000) (5,810,000,000)  
Carrying Value 143,082,000,000 130,161,000,000  
Unsecured long-term borrowings | Not accounted for as hedges      
Derivative [Line Items]      
Cumulative hedging adjustments for items no longer designated in a hedging relationship (133,000,000) 0  
Investments | Accounted for as hedges      
Derivative [Line Items]      
Carrying Value $ 42,449,000,000 $ 34,755,000,000