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Loans - Summary of Estimated Fair Value of Loans and Lending Commitments that are not Accounted for at Fair Value (Detail) - USD ($)
$ in Millions
Sep. 30, 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 $ 222,379 $ 196,200
Loans held for sale 2,502 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 2,502 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 1,772 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 758 600
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 2,530 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 214,379 187,215
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 214,379 187,215
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 110,254 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 106,095 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 216,349 189,330
Held For Sale    
Schedule Of Estimated Fair Value Of Loans And Lending Commitments That Are Not Accounted For At Fair Value [Line Items]    
Loans 2,502 3,525
Loans held for sale $ 2,502 $ 3,525