v3.25.2
FVM - Movements of level 3 instruments - Liabilities (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Total Level 3 liabilities $ 437,027   $ 384,465 $ 401,514
Level 3        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Total Level 3 liabilities 19,351   $ 19,632 $ 20,405
Level 3 | Loan commitments measured at FVTPL        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 100      
Balance at the end of period 0      
Level 3 | Derivative financial instruments        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 4,100 $ 5,600    
Total gains / losses included in comprehensive income - Net gains / losses included in income 200 (800)    
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 200 (300)    
Purchases 0 0    
Sales (0) (200)    
Issuances 1,200 1,700    
Settlements (1,000) (1,400)    
Transfers into Level 3 100 300    
Transfers out of Level 3 (600) (600)    
Foreign currency translation 100 0    
Balance at the end of period 4,100 4,400    
Level 3 | Derivative financial instruments | Interest rate        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 300 200    
Total gains / losses included in comprehensive income - Net gains / losses included in income 100 (100)    
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 100 100    
Purchases 0 0    
Sales (0) (0)    
Issuances 0 0    
Settlements (100) (0)    
Transfers into Level 3 0 100    
Transfers out of Level 3 (0) (0)    
Foreign currency translation 0 0    
Balance at the end of period 300 200    
Level 3 | Derivative financial instruments | Equity / index        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 3,100 3,300    
Total gains / losses included in comprehensive income - Net gains / losses included in income 200 0    
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 200 0    
Purchases 0 0    
Sales (0) (100)    
Issuances 1,100 1,500    
Settlements (600) (1,100)    
Transfers into Level 3 100 200    
Transfers out of Level 3 (500) (500)    
Foreign currency translation 100 0    
Balance at the end of period 3,500 3,400    
Level 3 | Derivative financial instruments | Credit        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 400 600    
Total gains / losses included in comprehensive income - Net gains / losses included in income 0 (100)    
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period (100) (100)    
Purchases 0 0    
Sales (0) (0)    
Issuances 100 100    
Settlements (200) (200)    
Transfers into Level 3 0 0    
Transfers out of Level 3 (0) (0)    
Foreign currency translation 0 0    
Balance at the end of period 200 400    
Level 3 | Derivative financial instruments | Loan commitments measured at FVTPL        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 100 1,000    
Total gains / losses included in comprehensive income - Net gains / losses included in income 0 (600)    
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0 (200)    
Purchases 0 0    
Sales (0) (100)    
Issuances 0 0    
Settlements (0) (0)    
Transfers into Level 3 0 0    
Transfers out of Level 3 (0) (0)    
Foreign currency translation 0 0    
Balance at the end of period 0 300    
Level 3 | Debt issued designated at fair value        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 13,300 15,300    
Total gains / losses included in comprehensive income - Net gains / losses included in income 200 (400)    
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 200 0    
Purchases 0 0    
Sales (0) (0)    
Issuances 2,600 3,000    
Settlements (1,700) (2,900)    
Transfers into Level 3 800 700    
Transfers out of Level 3 (2,900) (2,700)    
Foreign currency translation 500 (100)    
Balance at the end of period 12,900 13,000    
Level 3 | Other financial liabilities designated at fair value        
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]        
Balance at the beginning of the period 2,800 2,600    
Total gains / losses included in comprehensive income - Net gains / losses included in income 0 (100)    
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0 0    
Purchases 0 0    
Sales (0) (0)    
Issuances 400 1,100    
Settlements (800) (500)    
Transfers into Level 3 0 400    
Transfers out of Level 3 (0) (100)    
Foreign currency translation 0 0    
Balance at the end of period $ 2,300 $ 3,400