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Segmental information - Geographical analysis (Details) - GBP (£) £ in Millions	6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of geographical areas [line items]
Sales	£ 11,753	£ 10,436
Great Britain
Disclosure of geographical areas [line items]
Sales	1,204	1,044
United States
Disclosure of geographical areas [line items]
Sales	3,072	2,817
India
Disclosure of geographical areas [line items]
Sales	1,704	1,650
Rest of World
Disclosure of geographical areas [line items]
Sales	£ 5,773	£ 4,925

X

- 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 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 2021-01-01
-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 2021-03-24

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