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Dividends and other reserves - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Jan. 29, 2024	Dec. 31, 2022		Dec. 31, 2023	Jun. 30, 2023	[1]
Disclosure of reserves within equity [line items]
Interim dividend per share (in USD per share)		$ 0.3857
Other reserves		$ 560	[1]	$ 502	$ 665
Capital redemption reserve		3,869		4,076
Hedging reserve surplus		115		270
Exchange reserve deficit		$ (3,424)		(3,844)
Interest rate risk [member] | Hedges of net investment in foreign operations [member]
Disclosure of reserves within equity [line items]
Hedging reserve surplus				$ 60
Major ordinary share transactions
Disclosure of reserves within equity [line items]
Interim dividend per share (in USD per share)	$ 0.4050
[1] (1) See page F-7 for an explanation under Basis of preparation.

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- Definition

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

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

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