Share-based payments - Summary of Cost Related to Share-Based Payment Transactions (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statements [Line Items]
Equity-settled	$ 60	$ 51	$ 44
Total	67	56	46
Operating profit [Member]
Statements [Line Items]
Equity-settled	37	31	28
Cash-settled	7	5	2
System Fund [member]
Statements [Line Items]
Equity-settled	$ 23	$ 20	$ 16

The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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-URIDate 2024-03-27

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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
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-URIDate 2024-03-27

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- Definition

The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets.

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- Definition

Statements [Line Items]

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