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Borrowings - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2025
Jun. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]        
Senior notes     $ 3,745 $ 3,745
FHLB of New York        
Debt Instrument [Line Items]        
Available line of credit     17,800  
FRB of New York        
Debt Instrument [Line Items]        
Available line of credit     25,100  
Five Point One Seven Nine Percentage Fixed Rate Senior Notes Due To Mature In July 2030        
Debt Instrument [Line Items]        
Senior notes     $ 750  
Debt instrument, interest rate, stated percentage     5.179%  
Variable rate   1.40%    
Four Point Seven Six Two Percentage Fixed Rate Senior Notes Due To Mature In July 2027        
Debt Instrument [Line Items]        
Senior notes     $ 750  
Debt instrument, interest rate, stated percentage     4.762%  
Variable rate   0.95%    
Five Point Four Zero Percentage Fixed Rate Senior Notes Due To Mature In July 2030        
Debt Instrument [Line Items]        
Senior notes $ 750      
Debt instrument, interest rate, stated percentage 5.40%      
Variable rate 1.43%