v3.26.1
Loans - Summary of Credit Concentration by Region (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Product Information [Line Items]    
Carrying Value $ 255,194 $ 239,882
Concentration risk percentage 100 100
Americas    
Product Information [Line Items]    
Concentration risk percentage 82 81
EMEA    
Product Information [Line Items]    
Concentration risk percentage 15 16
Asia    
Product Information [Line Items]    
Concentration risk percentage 3 3
Corporate    
Product Information [Line Items]    
Carrying Value $ 38,156 $ 30,676
Concentration risk percentage 100 100
Corporate | Americas    
Product Information [Line Items]    
Concentration risk percentage 69 66
Corporate | EMEA    
Product Information [Line Items]    
Concentration risk percentage 22 25
Corporate | Asia    
Product Information [Line Items]    
Concentration risk percentage 9 9
Commercial real estate    
Product Information [Line Items]    
Carrying Value $ 38,779 $ 37,409
Concentration risk percentage 100 100
Commercial real estate | Americas    
Product Information [Line Items]    
Concentration risk percentage 78 76
Commercial real estate | EMEA    
Product Information [Line Items]    
Concentration risk percentage 18 20
Commercial real estate | Asia    
Product Information [Line Items]    
Concentration risk percentage 4 4
Residential real estate    
Product Information [Line Items]    
Carrying Value $ 32,885 $ 31,957
Concentration risk percentage 100 100
Residential real estate | Americas    
Product Information [Line Items]    
Concentration risk percentage 92 92
Residential real estate | EMEA    
Product Information [Line Items]    
Concentration risk percentage 6 7
Residential real estate | Asia    
Product Information [Line Items]    
Concentration risk percentage 2 1
Securities-based    
Product Information [Line Items]    
Carrying Value $ 18,592 $ 18,079
Concentration risk percentage 100 100
Securities-based | Americas    
Product Information [Line Items]    
Concentration risk percentage 80 78
Securities-based | EMEA    
Product Information [Line Items]    
Concentration risk percentage 20 22
Securities-based | Asia    
Product Information [Line Items]    
Concentration risk percentage
Other collateralized    
Product Information [Line Items]    
Carrying Value $ 104,592 $ 98,999
Concentration risk percentage 100 100
Other collateralized | Americas    
Product Information [Line Items]    
Concentration risk percentage 81 80
Other collateralized | EMEA    
Product Information [Line Items]    
Concentration risk percentage 18 18
Other collateralized | Asia    
Product Information [Line Items]    
Concentration risk percentage 1 2
Credit cards    
Product Information [Line Items]    
Carrying Value $ 19,055 $ 19,742
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 $ 3,135 $ 3,020
Concentration risk percentage 100 100
Other | Americas    
Product Information [Line Items]    
Concentration risk percentage 97 97
Other | EMEA    
Product Information [Line Items]    
Concentration risk percentage 3 3
Other | Asia    
Product Information [Line Items]    
Concentration risk percentage
Technology Media Telecommunications    
Product Information [Line Items]    
Concentration risk percentage 33 26
Diversified Industrials    
Product Information [Line Items]    
Concentration risk percentage 17 18
Real estate    
Product Information [Line Items]    
Concentration risk percentage 13 16
Financial Institution    
Product Information [Line Items]    
Concentration risk percentage 8 8
Consumer and Retail    
Product Information [Line Items]    
Concentration risk percentage 9 10