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Financial instruments and risk management - Credit risk - Narrative (Details) £ in Millions, $ in Millions	Jun. 30, 2022 GBP (£)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 GBP (£)	Jun. 30, 2021 USD ($)
Disclosure of detailed information about financial instruments [abstract]
Maximum exposure to credit risk	£ 5,445		£ 5,360
Collateral held under agreements	£ 19	$ 23	£ 98	$ 136

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

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+ Details

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X

- 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
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