v3.26.1
Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Amortized Cost    
Securities held to maturity, Due in one year or less, Amortized Cost $ 19  
Securities held to maturity, After one year through five years, Amortized Cost 18  
Securities held to maturity, After five years through ten years, Amortized Cost 176  
Securities held to maturity, After ten years, Amortized Cost 1,250  
Securities held to maturity, Mortgage backed securities, Amortized Cost 162  
Amortized cost 1,625 $ 1,584
Held-to-maturity    
Securities held to maturity, Due in one year or less, Estimated Fair Value 20  
Securities held to maturity, After one year through five years, Estimated Fair Value 18  
Securities held to maturity, After five years through ten years, Estimated Fair Value 169  
Securities held to maturity, After ten years, Estimated Fair Value 1,110  
Debt securities, held to maturity, Mortgage backed securities, Estimated Fair Value 133  
Investment securities - HTM, fair value 1,450 1,427
Amortized Cost    
Securities available for sale, Due in one year or less, Amortized Cost 952  
Securities available for sale, After one year through five years, Amortized Cost 1,460  
Securities available for sale, After five years through ten years, Amortized Cost 575  
Securities available for sale, After ten years, Amortized Cost 6,915  
Securities available for sale, Mortgage backed securities, Amortized Cost 9,441  
Securities available for sale Total, Amortized Cost 19,343  
Estimated Fair Value    
Securities available for sale, Due in one year or less, Estimated Fair Value 950  
Securities available for sale, After one year through five years, Estimated Fair Value 1,456  
Securities available for sale, After five years through ten years, Estimated Fair Value 571  
Securities available for sale, After ten years, Estimated Fair Value 6,751  
Securities available for sale, Mortgage backed securities, Estimated Fair Value 8,973  
Securities available for sale Total, Estimated Fair Value $ 18,701 $ 18,788