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Loans - Summary of Past Due Loans (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Past Due [Line Items]    
Carrying Value $ 226,887 $ 200,866
Total divided by gross loans at amortized cost 0.70% 0.70%
Corporate    
Financing Receivable, Past Due [Line Items]    
Carrying Value $ 31,804 $ 29,972
Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 33,952 29,789
Residential real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 30,147 25,969
Securities-based    
Financing Receivable, Past Due [Line Items]    
Carrying Value 18,469 16,477
Other collateralized    
Financing Receivable, Past Due [Line Items]    
Carrying Value 89,764 75,107
Credit cards    
Financing Receivable, Past Due [Line Items]    
Carrying Value 20,017 21,403
Other    
Financing Receivable, Past Due [Line Items]    
Carrying Value 2,734 2,149
Past due    
Financing Receivable, Past Due [Line Items]    
Carrying Value 1,440 1,392
Past due | Corporate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 143 15
Past due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 318 472
Past due | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 43 21
Past due | Securities-based    
Financing Receivable, Past Due [Line Items]    
Carrying Value 7 6
Past due | Other collateralized    
Financing Receivable, Past Due [Line Items]    
Carrying Value 68 5
Past due | Credit cards    
Financing Receivable, Past Due [Line Items]    
Carrying Value 848 873
Past due | Other    
Financing Receivable, Past Due [Line Items]    
Carrying Value 13  
30-89 days    
Financing Receivable, Past Due [Line Items]    
Carrying Value 599 612
30-89 days | Corporate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 60 0
30-89 days | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 24 186
30-89 days | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 23 3
30-89 days | Securities-based    
Financing Receivable, Past Due [Line Items]    
Carrying Value 7 6
30-89 days | Other collateralized    
Financing Receivable, Past Due [Line Items]    
Carrying Value 58 0
30-89 days | Credit cards    
Financing Receivable, Past Due [Line Items]    
Carrying Value 427 417
30-89 days | Other    
Financing Receivable, Past Due [Line Items]    
Carrying Value 0  
90 days or more    
Financing Receivable, Past Due [Line Items]    
Carrying Value 841 780
90 days or more | Corporate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 83 15
90 days or more | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 294 286
90 days or more | Residential real estate    
Financing Receivable, Past Due [Line Items]    
Carrying Value 20 18
90 days or more | Securities-based    
Financing Receivable, Past Due [Line Items]    
Carrying Value 0 0
90 days or more | Other collateralized    
Financing Receivable, Past Due [Line Items]    
Carrying Value 10 5
90 days or more | Credit cards    
Financing Receivable, Past Due [Line Items]    
Carrying Value 421 $ 456
90 days or more | Other    
Financing Receivable, Past Due [Line Items]    
Carrying Value $ 13