Financial instruments and risk management - Currency risk - Narrative (Details) - GBP (£) £ in Millions	12 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items]
Foreign currency borrowings and financial derivatives designated in net investment hedge relationships	£ 23,276	£ 23,551
US dollar \| Transaction exposure hedging risk
Disclosure of detailed information about financial instruments [line items]
Maximum hedging period (in months)	24 months
Target hedge ratio	75.00%
Other Currencies \| Transaction exposure hedging risk
Disclosure of detailed information about financial instruments [line items]
Maximum hedging period (in months)	18 months
Net investment hedges
Disclosure of detailed information about financial instruments [line items]
Maximum total net investment value at risk to total net asset percentage	20.00%
Value at risk, loss defining period (in years)	1 year
Percentage of probability confidence level	95.00%
Foreign currency borrowings and financial derivatives designated in net investment hedge relationships	£ 10,627	£ 8,742

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 25
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_FinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant