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Financial instruments and risk management - Schedule of financial assets and liabilities (Details) - GBP (£) £ in Millions | Jun. 30, 2022 | Jun. 30, 2021
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Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | £ 6,051 | £ 5,766
Current assets | 5,469 | 5,255
Non-current assets | 582 | 511
Financial liabilities | (23,551) | (20,445)
Current liabilities | (7,970) | (6,858)
Non-current liabilities | (15,581) | (13,587)
Total net financial assets/(liabilities) | (17,500) | (14,679)
Total net financial assets/(liabilities) current | (2,501) | (1,603)
Total net financial assets/(liabilities) non-current | (14,999) | (13,076)
Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (16,020) | (14,727)
Current liabilities | (1,522) | (1,862)
Non-current liabilities | (14,498) | (12,865)
Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (6,267) | (4,986)
Current liabilities | (5,887) | (4,648)
Non-current liabilities | (380) | (338)
Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (388) | (267)
Current liabilities | (388) | (261)
Non-current liabilities | 0 | (6)
Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (475) | (363)
Current liabilities | (85) | (82)
Non-current liabilities | (390) | (281)
Total other financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (1,264) | (732)
Current liabilities | (561) | (348)
Non-current liabilities | (703) | (384)
Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 200 | 148
Non-current assets | 200 | 148
Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,970 | 2,421
Current assets | 2,933 | 2,385
Non-current assets | 37 | 36
Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,285 | 2,749
Current assets | 2,285 | 2,749
Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 136 | 55
Current assets | 136 | 46
Non-current assets | 0 | 9
Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3 | 5
Non-current assets | 3 | 5
Total other financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 596 | 448
Current assets | 251 | 121
Non-current assets | 345 | 327
Fair value hedges | Interest rate risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (284) | (43)
Current liabilities | (1) |
Non-current liabilities | (283) | (43)
Fair value hedges | Interest rate risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1 | 106
Current assets | 0 | 4
Non-current assets | 1 | 102
Cash flow hedges | Foreign currency debt risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities |  | (51)
Non-current liabilities |  | (51)
Cash flow hedges | Foreign currency debt risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 367 | 205
Current assets | 43 |
Non-current assets | 324 | 205
Cash flow hedges | Foreign currency exchange risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (109) | (8)
Current liabilities | (81) | (5)
Non-current liabilities | (28) | (3)
Cash flow hedges | Foreign currency exchange risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 32 | 61
Current assets | 15 | 57
Non-current assets | 17 | 4
Cash flow hedges | Commodity price risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (7) |
Current liabilities | (5) |
Non-current liabilities | (2) |
Cash flow hedges | Commodity price risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 57 | 16
Current assets | 57 | 14
Non-current assets | 0 | 2
Net investment hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (8,742) | (7,780)
Fair value through income statement |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (1,043) | (707)
Fair value through income statement | Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (371) | (429)
Fair value through income statement | Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (271) | (176)
Fair value through income statement | Total other financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (672) | (278)
Fair value through income statement | Fair value hedges | Interest rate risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (284) | (43)
Fair value through income statement | Cash flow hedges | Foreign currency debt risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities |  | (51)
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 | (109) | (8)
Fair value through income statement | Cash flow hedges | Commodity price risk | Derivative liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (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) |
Current liabilities | (1) |
Liabilities at amortised cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (21,386) | (18,761)
Liabilities at amortised cost | Borrowings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (16,020) | (14,727)
Liabilities at amortised cost | Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (4,774) | (3,580)
Liabilities at amortised cost | Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (117) | (91)
Liabilities at amortised cost | Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (475) | (363)
Liabilities at amortised cost | Total other financial liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (592) | (454)
Not categorised as a financial instrument |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (1,122) | (977)
Not categorised as a financial instrument | Trade and other payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | (1,122) | (977)
Fair value through income statement |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 773 | 564
Fair value through income statement | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 180 | 121
Fair value through income statement | Other instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 136 | 55
Fair value through income statement | Total other financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 593 | 443
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 | 106
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 | 367 | 205
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 | 32 | 61
Fair value through income statement | Cash flow hedges | Commodity price risk | Derivatives assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 57 | 16
Fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 4 | 17
Fair value through other comprehensive income | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 4 | 17
Assets at amortised cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 4,668 | 4,779
Assets at amortised cost | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 15 | 8
Assets at amortised cost | Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,365 | 2,017
Assets at amortised cost | Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,285 | 2,749
Assets at amortised cost | Leases |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3 | 5
Assets at amortised cost | Total other financial assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3 | 5
Not categorised as a financial instrument |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 606 | 406
Not categorised as a financial instrument | Other investments and loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1 | 2
Not categorised as a financial instrument | Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 605 | 404
Fair value through income statement |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | (270) | (143)
Fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | 4 | 17
Assets and liabilities at amortised cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | (16,718) | (13,982)
Not categorised as a financial instrument |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net financial assets/(liabilities) | £ (516) | £ (571)

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