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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
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)