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Commitments, Contingencies and Guarantees - Lending Commitments (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Other Commitments [Line Items]    
Total commitments $ 547,520 $ 447,126
Total lending    
Other Commitments [Line Items]    
Total commitments 319,885 283,442
Amortized Cost    
Other Commitments [Line Items]    
Total commitments 302,646 262,604
Held For Sale    
Other Commitments [Line Items]    
Total commitments 15,680 20,258
Fair Value    
Other Commitments [Line Items]    
Total commitments $ 1,559 $ 580