v3.26.1
Derivatives and Hedging Activities - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
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 $ 28,970,000,000   $ 22,890,000,000
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  
Change in unrealized gain (loss) on fair value hedges 0 0  
Amount reclassified to earnings from accumulated other comprehensive income/(loss) $ 0 $ 0  
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 $ 85,610,000,000   42,440,000,000
Unsecured long-term borrowings | Accounted for as hedges      
Derivative [Line Items]      
Cumulative hedging adjustment (4,560,000,000)   (4,610,000,000)
Carrying Value 163,404,000,000   143,082,000,000
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)
Investments | Accounted for as hedges      
Derivative [Line Items]      
Carrying Value $ 85,149,000,000   $ 42,449,000,000