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Financial instruments and risk management - Schedule of financial assets and liabilities (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022
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Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | £ 5,156 | £ 6,051
Current assets | 4,506 | 5,469
Non-current assets | 650 | 582
Financial liabilities | (23,276) | (23,551)
Current liabilities | (7,360) | (7,970)
Non-current liabilities | (15,916) | (15,581)
Total net financial assets/(liabilities) | (18,120) | (17,500)
Total net financial assets/(liabilities) current | (2,854) | (2,501)
Total net financial assets/(liabilities) non-current | (15,266) | (14,999)
Borrowings | 16,502 | 16,020
Quoted | Fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings | 15,641 | 15,628
Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (16,502) | (16,020)
Current liabilities | (1,701) | (1,522)
Non-current liabilities | (14,801) | (14,498)
Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (5,668) | (6,267)
Current liabilities | (5,300) | (5,887)
Non-current liabilities | (368) | (380)
Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (245) | (388)
Current liabilities | (245) | (388)
Non-current liabilities | 0 | 0
Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (448) | (475)
Current liabilities | (75) | (85)
Non-current liabilities | (373) | (390)
Total other financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (1,106) | (1,264)
Current liabilities | (359) | (561)
Non-current liabilities | (747) | (703)
Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 225 | 200
Non-current assets | 225 | 200
Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,751 | 2,970
Current assets | 2,720 | 2,933
Non-current assets | 31 | 37
Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,439 | 2,285
Current assets | 1,439 | 2,285
Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 198 | 136
Current assets | 198 | 136
Non-current assets | 0 | 0
Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1 | 3
Non-current assets | 1 | 3
Total other financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 741 | 596
Current assets | 347 | 251
Non-current assets | 394 | 345
Fair value hedges | Interest rate risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (377) | (284)
Current liabilities | (6) | (1)
Non-current liabilities | (371) | (283)
Fair value hedges | Interest rate risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets |  | 1
Current assets |  | 0
Non-current assets |  | 1
Cash flow hedges | Foreign currency debt risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 348 | 367
Current assets | 0 | 43
Non-current assets | 348 | 324
Cash flow hedges | Foreign currency exchange risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (9) | (109)
Current liabilities | (7) | (81)
Non-current liabilities | (2) | (28)
Cash flow hedges | Foreign currency exchange risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 192 | 32
Current assets | 147 | 15
Non-current assets | 45 | 17
Cash flow hedges | Commodity price risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (27) | (7)
Current liabilities | (26) | (5)
Non-current liabilities | (1) | (2)
Cash flow hedges | Commodity price risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2 | 57
Current assets | 2 | 57
Non-current assets | 0 | 0
Net investment hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (10,627) | (8,742)
Net investment hedges | Foreign exchange risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities |  | (1)
Current liabilities |  | (1)
Fair value through income statement |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (969) | (1,043)
Fair value through income statement | Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (311) | (371)
Fair value through income statement | Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (245) | (271)
Fair value through income statement | Total other financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (658) | (672)
Fair value through income statement | Fair value hedges | Interest rate risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (377) | (284)
Fair value through income statement | Cash flow hedges | Foreign currency exchange risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (9) | (109)
Fair value through income statement | Cash flow hedges | Commodity price risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (27) | (7)
Fair value through income statement | Net investment hedges | Foreign exchange risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities |  | (1)
Liabilities at amortised cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (21,422) | (21,386)
Liabilities at amortised cost | Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (16,502) | (16,020)
Liabilities at amortised cost | Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (4,472) | (4,774)
Liabilities at amortised cost | Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 0 | (117)
Liabilities at amortised cost | Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (448) | (475)
Liabilities at amortised cost | Total other financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (448) | (592)
Not categorised as a financial instrument |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (885) | (1,122)
Not categorised as a financial instrument | Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (885) | (1,122)
Fair value through income statement |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 932 | 773
Fair value through income statement | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 192 | 180
Fair value through income statement | Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 198 | 136
Fair value through income statement | Total other financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 740 | 593
Fair value through income statement | Fair value hedges | Interest rate risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets |  | 1
Fair value through income statement | Cash flow hedges | Foreign currency debt risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 348 | 367
Fair value through income statement | Cash flow hedges | Foreign currency exchange risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 192 | 32
Fair value through income statement | Cash flow hedges | Commodity price risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2 | 57
Fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 4
Fair value through other comprehensive income | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 4
Assets at amortised cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,705 | 4,668
Assets at amortised cost | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 31 | 15
Assets at amortised cost | Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,234 | 2,365
Assets at amortised cost | Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,439 | 2,285
Assets at amortised cost | Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1 | 3
Assets at amortised cost | Total other financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1 | 3
Not categorised as a financial instrument |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 519 | 606
Not categorised as a financial instrument | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2 | 1
Not categorised as a financial instrument | Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 517 | 605
Fair value through income statement |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | (37) | (270)
Fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | 0 | 4
Assets and liabilities at amortised cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | (17,717) | (16,718)
Not categorised as a financial instrument |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | £ (366) | £ (516)

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