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Loans - Summary of Credit Concentration by Region (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Product Information [Line Items]    
Carrying Value $ 226,887 $ 200,866
Concentration risk percentage 100 100
Americas    
Product Information [Line Items]    
Concentration risk percentage 81 83
EMEA    
Product Information [Line Items]    
Concentration risk percentage 16 14
Asia    
Product Information [Line Items]    
Concentration risk percentage 3 3
Corporate    
Product Information [Line Items]    
Carrying Value $ 31,804 $ 29,972
Concentration risk percentage 100 100
Corporate | Americas    
Product Information [Line Items]    
Concentration risk percentage 65 66
Corporate | EMEA    
Product Information [Line Items]    
Concentration risk percentage 26 26
Corporate | Asia    
Product Information [Line Items]    
Concentration risk percentage 9 8
Commercial real estate    
Product Information [Line Items]    
Carrying Value $ 33,952 $ 29,789
Concentration risk percentage 100 100
Commercial real estate | Americas    
Product Information [Line Items]    
Concentration risk percentage 76 78
Commercial real estate | EMEA    
Product Information [Line Items]    
Concentration risk percentage 19 18
Commercial real estate | Asia    
Product Information [Line Items]    
Concentration risk percentage 5 4
Residential real estate    
Product Information [Line Items]    
Carrying Value $ 30,147 $ 25,969
Concentration risk percentage 100 100
Residential real estate | Americas    
Product Information [Line Items]    
Concentration risk percentage 93 94
Residential real estate | EMEA    
Product Information [Line Items]    
Concentration risk percentage 5 5
Residential real estate | Asia    
Product Information [Line Items]    
Concentration risk percentage 2 1
Securities-based    
Product Information [Line Items]    
Carrying Value $ 18,469 $ 16,477
Concentration risk percentage 100 100
Securities-based | Americas    
Product Information [Line Items]    
Concentration risk percentage 75 76
Securities-based | EMEA    
Product Information [Line Items]    
Concentration risk percentage 25 24
Securities-based | Asia    
Product Information [Line Items]    
Concentration risk percentage
Other collateralized    
Product Information [Line Items]    
Carrying Value $ 89,764 $ 75,107
Concentration risk percentage 100 100
Other collateralized | Americas    
Product Information [Line Items]    
Concentration risk percentage 81 86
Other collateralized | EMEA    
Product Information [Line Items]    
Concentration risk percentage 17 12
Other collateralized | Asia    
Product Information [Line Items]    
Concentration risk percentage 2 2
Credit cards    
Product Information [Line Items]    
Carrying Value $ 20,017 $ 21,403
Concentration risk percentage 100 100
Credit cards | Americas    
Product Information [Line Items]    
Concentration risk percentage 100 100
Credit cards | EMEA    
Product Information [Line Items]    
Concentration risk percentage
Credit cards | Asia    
Product Information [Line Items]    
Concentration risk percentage
Other    
Product Information [Line Items]    
Carrying Value $ 2,734 $ 2,149
Concentration risk percentage 100 100
Other | Americas    
Product Information [Line Items]    
Concentration risk percentage 97 96
Other | EMEA    
Product Information [Line Items]    
Concentration risk percentage 3 4
Other | Asia    
Product Information [Line Items]    
Concentration risk percentage
Technology Media Telecommunications    
Product Information [Line Items]    
Concentration risk percentage 26 24
Diversified Industrials    
Product Information [Line Items]    
Concentration risk percentage 18 16
Real estate    
Product Information [Line Items]    
Concentration risk percentage 14 14
Financial Institution    
Product Information [Line Items]    
Concentration risk percentage 9 9
Consumer and Retail    
Product Information [Line Items]    
Concentration risk percentage 10  
Healthcare    
Product Information [Line Items]    
Concentration risk percentage   9