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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
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)