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Dividends and other reserves - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Feb. 03, 2025	Dec. 31, 2023	Dec. 31, 2024	Jun. 30, 2024
Disclosure of reserves within equity [line items]
Other reserves		$ 502	$ (464)	$ (91)
Capital redemption reserve		4,076	4,082
Hedging reserve surplus/(deficit)		270	121
Exchange reserve deficit		(3,844)	(4,667)
Interest rate risk | Hedges of net investment in foreign operations
Disclosure of reserves within equity [line items]
Hedging reserve surplus/(deficit)		$ (60)	$ 9
Major ordinary share transactions
Disclosure of reserves within equity [line items]
Interim dividend per share (in USD per share)	$ 0.4050	$ 0.4050

X

- Definition

A component of equity representing the reserve for the redemption of the entity's own shares.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

A component of equity representing exchange differences on translation of financial statements recognised in other comprehensive income and accumulated in equity. [Refer: Other comprehensive income]

+ References

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