v3.26.1
FVM - Movements of level 3 instruments - Liabilities (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]      
Total Level 3 liabilities $ 490,755   $ 414,123
Level 3      
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]      
Total Level 3 liabilities 19,197   $ 19,415
Net gains / losses that is included in comprehensive income (200) $ 200  
Net gains / losses recognized in the Income statement (300) 100  
Net gains / losses recognized in the Statement of comprehensive income 100 100  
Level 3 | Loan commitments measured at FVTPL      
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]      
Balance at the beginning of the period 0    
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 5,000 4,100  
Total gains / losses included in comprehensive income - Net gains / losses included in income 700 200  
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 600 200  
Purchases 0 0  
Sales (0) (0)  
Issuances 1,400 1,200  
Settlements (1,500) (1,000)  
Transfers into Level 3 300 100  
Transfers out of Level 3 (500) (600)  
Foreign currency translation 0 100  
Balance at the end of period 5,400 4,100  
Level 3 | Derivative financial instruments | of which: Interest rate      
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]      
Balance at the beginning of the period 300 300  
Total gains / losses included in comprehensive income - Net gains / losses included in income 200 100  
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 (200) (100)  
Transfers into Level 3 0 0  
Transfers out of Level 3 (100) (0)  
Foreign currency translation 0 0  
Balance at the end of period 300 300  
Level 3 | Derivative financial instruments | of which: Equity / index      
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]      
Balance at the beginning of the period 4,200 3,100  
Total gains / losses included in comprehensive income - Net gains / losses included in income 500 200  
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 500 200  
Purchases 0 0  
Sales (0) (0)  
Issuances 1,100 1,100  
Settlements (1,300) (600)  
Transfers into Level 3 200 100  
Transfers out of Level 3 (400) (500)  
Foreign currency translation 0 100  
Balance at the end of period 4,400 3,500  
Level 3 | Derivative financial instruments | of which: Credit      
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]      
Balance at the beginning of the period 300 400  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0 0  
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0 (100)  
Purchases 0 0  
Sales (0) (0)  
Issuances 200 100  
Settlements (0) (200)  
Transfers into Level 3 100 0  
Transfers out of Level 3 (0) (0)  
Foreign currency translation 0 0  
Balance at the end of period 500 200  
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 0 100  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0 0  
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 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 0  
Level 3 | Debt issued designated at fair value      
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]      
Balance at the beginning of the period 12,700 13,300  
Total gains / losses included in comprehensive income - Net gains / losses included in income 400 200  
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 300 200  
Purchases 0 0  
Sales (0) (0)  
Issuances 3,700 2,600  
Settlements (2,300) (1,700)  
Transfers into Level 3 600 800  
Transfers out of Level 3 (2,400) (2,900)  
Foreign currency translation (100) 500  
Balance at the end of period 12,500 12,900  
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 1,600 2,800  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0 0  
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 300 400  
Settlements (600) (800)  
Transfers into Level 3 0 0  
Transfers out of Level 3 (0) (0)  
Foreign currency translation 0 0  
Balance at the end of period $ 1,300 $ 2,300