v3.26.1
Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Amortized Cost    
Securities held to maturity, Due in one year or less, Amortized Cost $ 18  
Securities held to maturity, After one year through five years, Amortized Cost 30  
Securities held to maturity, After five years through ten years, Amortized Cost 180  
Securities held to maturity, After ten years, Amortized Cost 1,289  
Securities held to maturity, Mortgage backed securities, Amortized Cost 159  
Amortized cost 1,676 $ 1,584
Held-to-maturity    
Securities held to maturity, Due in one year or less, Estimated Fair Value 18  
Securities held to maturity, After one year through five years, Estimated Fair Value 31  
Securities held to maturity, After five years through ten years, Estimated Fair Value 172  
Securities held to maturity, After ten years, Estimated Fair Value 1,146  
Debt securities, held to maturity, Mortgage backed securities, Estimated Fair Value 130  
Investment securities - HTM, fair value 1,497 1,427
Amortized Cost    
Securities available for sale, Due in one year or less, Amortized Cost 850  
Securities available for sale, After one year through five years, Amortized Cost 1,462  
Securities available for sale, After five years through ten years, Amortized Cost 469  
Securities available for sale, After ten years, Amortized Cost 7,187  
Securities available for sale, Mortgage backed securities, Amortized Cost 9,579  
Securities available for sale Total, Amortized Cost 19,547  
Estimated Fair Value    
Securities available for sale, Due in one year or less, Estimated Fair Value 847  
Securities available for sale, After one year through five years, Estimated Fair Value 1,450  
Securities available for sale, After five years through ten years, Estimated Fair Value 467  
Securities available for sale, After ten years, Estimated Fair Value 7,038  
Securities available for sale, Mortgage backed securities, Estimated Fair Value 9,078  
Securities available for sale Total, Estimated Fair Value $ 18,880 $ 18,788