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Loans - Summary of Nonaccrual Loans (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans $ 3,199 $ 3,652
Total divided by gross loans at amortized cost 1.50% 1.90%
Nonaccrual loans allowance for loans losses divided by total 140.90% 127.80%
Past due    
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans $ 126 $ 322
Corporate    
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans 1,863 1,977
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans 1,095 800
Residential real estate    
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans 90 104
Securities-based    
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans 0 2
Other collateralized    
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans 126 757
Other    
Financing Receivable, Impaired [Line Items]    
Nonaccrual loans $ 25 $ 12