Investments in securities - Summary of Investments in Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Investments In Securities [Line Items]
Investments in securities	$ 3,246	$ 3,362
At fair value
Disclosure Of Investments In Securities [Line Items]
Investments in securities	3,218	3,341
At fair value \| Measured by reference to prices in active markets for identical assets
Disclosure Of Investments In Securities [Line Items]
Investments in securities	1,983	1,884
At fair value \| Measured by reference to other observable inputs
Disclosure Of Investments In Securities [Line Items]
Investments in securities	92	158
At fair value \| Measured using predominantly unobservable inputs
Disclosure Of Investments In Securities [Line Items]
Investments in securities	1,143	1,299
At cost
Disclosure Of Investments In Securities [Line Items]
Investments in securities	28	21
Equity securities
Disclosure Of Investments In Securities [Line Items]
Investments in securities	1,605	1,533
Equity securities at fair value through other comprehensive income	1,605	1,533
Debt securities
Disclosure Of Investments In Securities [Line Items]
Investments in securities	1,641	1,829
Equity securities at fair value through other comprehensive income	1,285	1,308
Debt securities at amortised cost	28	21
Debt securities at fair value through profit or loss	$ 328	$ 500

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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