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Investments in securities - Summary of Investments in Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Investments In Securities [Line Items]    
Investments in securities $ 1,557 $ 2,255
At fair value    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities 1,518 2,218
At fair value | Measured by reference to prices in active markets for identical assets    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities 580 1,197
At fair value | Measured by reference to other observable inputs    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities 70 95
At fair value | Measured using more than an insignificant proportion of unobservable inputs    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities 868 926
At cost    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities 39 37
Equities    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities 1,079 1,104
Equity securities at fair value through other comprehensive income 1,079 1,104
Debt securities    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities 478 1,151
Equity securities at fair value through other comprehensive income 399 1,017
Equity securities at fair value through profit or loss 40 97
Debt securities at amortised cost $ 39 $ 37