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Financial instruments and risk management - Credit risk - Narrative (Details) £ in Millions, $ in Millions	Jun. 30, 2021 GBP (£)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 GBP (£)	Jun. 30, 2020 USD ($)
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	£ 5,360		£ 5,989
Collateral held under agreements	£ 98	$ 136	£ 180	$ 221

X

- Definition

The amount of cash collateral pledged that is subject to an enforceable master netting arrangement or similar agreement and that is not set off against financial liabilities. [Refer: Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
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+ Details

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Balance Type:	debit
Period Type:	instant

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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X

- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
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-URIDate 2020-01-01

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-URIDate 2020-01-01

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