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Net borrowings - Reconciliation of movement in net borrowings (Details) - GBP (£) £ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]
At beginning of the year	£ 13,246	£ 11,277
Net decrease/(increase) in cash and cash equivalents before exchange	231	(2,552)	£ (54)
Increase (decrease) through financing cash flows, liabilities arising from financing activities	(967)	4,089
Change in net borrowings from cash flows	(736)	1,537
Exchange differences on net borrowings	(598)	95
Other non-cash items(ii)	197	86
Adoption of IFRS 16	0	251
Net borrowings at end of the year	12,109	13,246	£ 11,277
Cash outflow for derivatives designated in forward point hedges	£ 2	6
Lease liabilities
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Other non-cash items(ii)		£ (206)

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- Definition

Change in net borrowings from cash flow, including cash and cash equivalents change, bonds and other borrowings.

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- Definition

Increase (Decrease) Through Adoption of IFRS 16, Liabilities Arising From Financing Activities

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- Definition

Payments For Derivatives Designated In Forward Point Hedges

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

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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.

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- Definition

The increase (decrease) in cash and cash equivalents before the effect of exchange rate changes on cash and cash equivalents held in foreign currencies. [Refer: Cash and cash equivalents; Effect of exchange rate changes on cash and cash equivalents]

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The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities]

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The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities]

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