v3.26.1
Fair values of financial instruments carried at fair value - Financial instruments measured at fair value using a valuation technique with significant unobservable inputs - Level 3 (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2023
Financial investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets $ 386,439 $ 385,122    
Recurring fair value measurement | Trading liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 86,363 72,122    
Recurring fair value measurement | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 173,751 158,456    
Recurring fair value measurement | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 254,662 237,854    
Recurring fair value measurement | Financial investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 386,439 385,122    
Recurring fair value measurement | Trading assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 423,987 366,153    
Recurring fair value measurement | Designated and otherwise mandatorily measured at fair value through profit or loss        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 138,942 133,063    
Recurring fair value measurement | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 255,995 237,740    
Recurring fair value measurement | Level 3        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 35,969 36,445    
Financial liabilities 17,218 14,242    
Recurring fair value measurement | Level 3 | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 1 1    
Recurring fair value measurement | Level 3 | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 13,281 10,617    
Recurring fair value measurement | Level 3 | Other derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 3,668 3,442    
Recurring fair value measurement | Level 3 | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 5 41    
Recurring fair value measurement | Level 3 | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 4 11    
Recurring fair value measurement | Level 3 | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 259 130    
Recurring fair value measurement | Level 3 | Trading liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 29 67 $ 47 $ 784
Recurring fair value measurement | Level 3 | Trading liabilities | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Trading liabilities | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Trading liabilities | Other derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Trading liabilities | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 5 41    
Recurring fair value measurement | Level 3 | Trading liabilities | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 4 11    
Recurring fair value measurement | Level 3 | Trading liabilities | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 20 15    
Recurring fair value measurement | Level 3 | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 13,521 10,733 9,020 9,117
Recurring fair value measurement | Level 3 | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 1 1    
Recurring fair value measurement | Level 3 | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 13,281 10,617    
Recurring fair value measurement | Level 3 | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss | Other derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Financial assets and liabilities designated and otherwise mandatorily measured at fair value through profit or loss | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 239 115    
Recurring fair value measurement | Level 3 | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 3,668 3,442 3,671 2,842
Recurring fair value measurement | Level 3 | Derivatives | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Other derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 3,668 3,442    
Recurring fair value measurement | Level 3 | Derivatives | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Level 3 | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 20,677 20,960    
Recurring fair value measurement | Level 3 | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2,046 2,183    
Recurring fair value measurement | Level 3 | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 6,744 7,475    
Recurring fair value measurement | Level 3 | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 4,046 3,253    
Recurring fair value measurement | Level 3 | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2,456 2,574    
Recurring fair value measurement | Level 3 | Financial investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 1,708 2,805 2,120 2,734
Recurring fair value measurement | Level 3 | Financial investments | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 481 595    
Recurring fair value measurement | Level 3 | Financial investments | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Financial investments | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Financial investments | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 1,135 2,111    
Recurring fair value measurement | Level 3 | Financial investments | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 22 21    
Recurring fair value measurement | Level 3 | Financial investments | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 70 78    
Recurring fair value measurement | Level 3 | Trading assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 6,843 6,097 5,223 6,675
Recurring fair value measurement | Level 3 | Trading assets | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2 1    
Recurring fair value measurement | Level 3 | Trading assets | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Trading assets | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Trading assets | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 3,804 3,356    
Recurring fair value measurement | Level 3 | Trading assets | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2,202 1,667    
Recurring fair value measurement | Level 3 | Trading assets | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 835 1,073    
Recurring fair value measurement | Level 3 | Designated and otherwise mandatorily measured at fair value through profit or loss        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 25,372 25,360 24,590 19,744
Recurring fair value measurement | Level 3 | Designated and otherwise mandatorily measured at fair value through profit or loss | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 20,194 20,364    
Recurring fair value measurement | Level 3 | Designated and otherwise mandatorily measured at fair value through profit or loss | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Designated and otherwise mandatorily measured at fair value through profit or loss | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Designated and otherwise mandatorily measured at fair value through profit or loss | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 1,805 2,008    
Recurring fair value measurement | Level 3 | Designated and otherwise mandatorily measured at fair value through profit or loss | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 1,822 1,565    
Recurring fair value measurement | Level 3 | Designated and otherwise mandatorily measured at fair value through profit or loss | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 1,551 1,423    
Recurring fair value measurement | Level 3 | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2,046 2,183 $ 2,634 $ 2,149
Recurring fair value measurement | Level 3 | Derivatives | Private equity including strategic investments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Structured notes        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Derivatives        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2,046 2,183    
Recurring fair value measurement | Level 3 | Derivatives | Bonds        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Loans        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Level 3 | Derivatives | Other portfolios        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets $ 0 $ 0