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Segmental information - Geographic analysis (Details) - GBP (£) £ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Disclosure of geographical areas [line items]
Sales	£ 19,153	£ 17,697	£ 19,294
Non-current assets	19,063	19,921	20,321
Great Britain
Disclosure of geographical areas [line items]
Sales	1,822	1,684	1,706
Non-current assets	2,119	1,911	1,637
United States
Disclosure of geographical areas [line items]
Sales	5,441	4,839	4,724
Non-current assets	4,320	5,028	4,662
Netherlands
Disclosure of geographical areas [line items]
Sales	70	62	70
Non-current assets	2,474	2,661	2,525
India
Disclosure of geographical areas [line items]
Sales	3,011	2,783	3,236
Non-current assets	2,561	2,758	3,829
Rest of World
Disclosure of geographical areas [line items]
Sales	8,809	8,329	9,558
Non-current assets	£ 7,589	£ 7,563	£ 7,668

X

- Definition

The amount of Intangible assets, property, plant and equipment, biological assets, investments in associates and joint ventures, other investments and non-current other receivables.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 113
-Subparagraph a
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-Paragraph 114
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-URIDate 2020-01-01

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