v3.25.4
Loans - Summary of Estimated Fair Value of Loans and Lending Commitments that are not Accounted for at Fair Value (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans $ 237,734 $ 196,200
Loans held for sale 22,066 3,525
Reported Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans held for sale 22,066 3,525
Level 2 | Estimate of Fair Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans held for sale 21,383 2,928
Level 3 | Estimate of Fair Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans held for sale 694 600
Total | Estimate of Fair Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans held for sale 22,077 3,528
Amortized Cost    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans 210,763 187,215
Amortized Cost | Reported Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans 210,763 187,215
Amortized Cost | Level 2 | Estimate of Fair Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans 113,861 99,790
Amortized Cost | Level 3 | Estimate of Fair Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans 97,210 89,540
Amortized Cost | Total | Estimate of Fair Value Measurement    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans 211,071 189,330
Held For Sale    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans 22,066 3,525
Loans held for sale $ 22,066 $ 3,525