Investments in securities - Summary of Investments in Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Investments In Securities [Line Items]
Investments in securities	$ 2,255	$ 3,246
At fair value
Disclosure Of Investments In Securities [Line Items]
Investments in securities	2,218	3,218
At fair value \| Measured by reference to prices in active markets for identical assets
Disclosure Of Investments In Securities [Line Items]
Investments in securities	1,197	1,983
At fair value \| Measured by reference to other observable inputs
Disclosure Of Investments In Securities [Line Items]
Investments in securities	95	92
At fair value \| Measured using predominantly unobservable inputs
Disclosure Of Investments In Securities [Line Items]
Investments in securities	926	1,143
At cost
Disclosure Of Investments In Securities [Line Items]
Investments in securities	37	28
Equities
Disclosure Of Investments In Securities [Line Items]
Investments in securities	1,104	1,605
Equity securities at fair value through other comprehensive income	1,104	1,605
Debt securities
Disclosure Of Investments In Securities [Line Items]
Investments in securities	1,151	1,641
Equity securities at fair value through other comprehensive income	1,017	1,285
Equity securities at fair value through profit or loss	97	328
Debt securities at amortised cost	$ 37	$ 28

The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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