v3.26.1
Fair values of financial instruments carried at fair value - Financial instruments carried at fair value and bases of valuation (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 | 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 | Trading liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 86,363 72,122    
Recurring fair value measurement | Trading liabilities | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Trading liabilities | Level 1        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 53,362 46,579    
Recurring fair value measurement | Trading liabilities | Level 1 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Trading liabilities | Level 2        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 32,972 25,476    
Recurring fair value measurement | Trading liabilities | Level 2 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Trading liabilities | Level 3        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 29 67 $ 47 $ 784
Recurring fair value measurement | Trading liabilities | Level 3 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Financial liabilities designated at fair value        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 173,751 158,456    
Recurring fair value measurement | Financial liabilities designated at fair value | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 206 1,345    
Recurring fair value measurement | Financial liabilities designated at fair value | Level 1        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 1,297 1,370    
Recurring fair value measurement | Financial liabilities designated at fair value | Level 1 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 197 1,345    
Recurring fair value measurement | Financial liabilities designated at fair value | Level 2        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 158,933 146,353    
Recurring fair value measurement | Financial liabilities designated at fair value | Level 2 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 9 0    
Recurring fair value measurement | Financial liabilities designated at fair value | Level 3        
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 | Financial liabilities designated at fair value | Level 3 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
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 | Derivatives | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 9 16    
Recurring fair value measurement | Derivatives | Level 1        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 2,565 1,853    
Recurring fair value measurement | Derivatives | Level 1 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 0 0    
Recurring fair value measurement | Derivatives | Level 2        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 248,429 232,559    
Recurring fair value measurement | Derivatives | Level 2 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 7 13    
Recurring fair value measurement | Derivatives | Level 3        
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 | Derivatives | Level 3 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities 2 3    
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 | Trading assets | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 59 113    
Recurring fair value measurement | Trading assets | Level 1        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 328,170 267,638    
Recurring fair value measurement | Trading assets | Level 1 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 9 26    
Recurring fair value measurement | Trading assets | Level 2        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 88,974 92,418    
Recurring fair value measurement | Trading assets | Level 2 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 50 87    
Recurring fair value measurement | Trading assets | Level 3        
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 | Trading assets | Level 3 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Financial assets 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 | Financial assets designated and otherwise mandatorily measured at fair value through profit or loss | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 11,067 6,351    
Recurring fair value measurement | Financial assets designated and otherwise mandatorily measured at fair value through profit or loss | Level 1        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 50,524 46,436    
Recurring fair value measurement | Financial assets designated and otherwise mandatorily measured at fair value through profit or loss | Level 1 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 7,521 6,327    
Recurring fair value measurement | Financial assets designated and otherwise mandatorily measured at fair value through profit or loss | Level 2        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 63,046 61,267    
Recurring fair value measurement | Financial assets designated and otherwise mandatorily measured at fair value through profit or loss | Level 2 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2,702 24    
Recurring fair value measurement | Financial assets designated and otherwise mandatorily measured at fair value through profit or loss | Level 3        
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 | Financial assets designated and otherwise mandatorily measured at fair value through profit or loss | Level 3 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 844 0    
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 | Derivatives | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 38 14    
Recurring fair value measurement | Derivatives | Level 1        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2,272 1,798    
Recurring fair value measurement | Derivatives | Level 1 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 0 0    
Recurring fair value measurement | Derivatives | Level 2        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 251,677 233,759    
Recurring fair value measurement | Derivatives | Level 2 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 36 9    
Recurring fair value measurement | Derivatives | Level 3        
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 | Derivatives | Level 3 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 2 5    
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 | Financial investments | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 1,883 201    
Recurring fair value measurement | Financial investments | Level 1        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 308,181 300,795    
Recurring fair value measurement | Financial investments | Level 1 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 1,682 157    
Recurring fair value measurement | Financial investments | Level 2        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 76,550 81,522    
Recurring fair value measurement | Financial investments | Level 2 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets 201 44    
Recurring fair value measurement | Financial investments | Level 3        
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 | Financial investments | Level 3 | Disposal groups classified as held for sale        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial assets $ 0 $ 0