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Financial instruments and risk management - Classification of financial assets and liabilities (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of detailed information about financial instruments [line items]    
Financial assets £ 5,766 £ 6,364
Current assets 5,255 5,509
Non-current assets 511 855
Financial liabilities (20,445) (21,425)
Current liabilities (6,858) (6,067)
Non-current liabilities (13,587) (15,358)
Total net financial assets/(liabilities) (14,679) (15,061)
Total net financial assets/(liabilities) current (1,603) (558)
Total net financial assets/(liabilities) non-current (13,076) (14,503)
Borrowings    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (14,727) (16,785)
Current liabilities (1,862) (1,995)
Non-current liabilities (12,865) (14,790)
Trade and other payables    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (4,986) (3,858)
Current liabilities (4,648) (3,683)
Non-current liabilities (338) (175)
Other instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (267) (236)
Current liabilities (261) (222)
Non-current liabilities (6) (14)
Leases    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (363) (470)
Current liabilities (82) (106)
Non-current liabilities (281) (364)
Total other financial liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (732) (782)
Current liabilities (348) (389)
Non-current liabilities (384) (393)
Other investments and loans    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 148 123
Non-current assets 148 123
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,421 2,157
Current assets 2,385 2,111
Non-current assets 36 46
Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,749 3,323
Current assets 2,749 3,323
Other instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 55 91
Current assets 46 73
Non-current assets 9 18
Leases    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 5 3
Non-current assets 5 3
Total other financial assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 448 761
Current assets 121 75
Non-current assets 327 686
Fair value hedges | Interest rate risk | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (43)  
Current liabilities 0  
Non-current liabilities (43)  
Fair value hedges | Interest rate risk | Derivatives assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 106 189
Current assets 4 0
Non-current assets 102 189
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 205 469
Non-current assets 205 469
Cash flow hedges | Foreign currency exchange risk | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (8) (66)
Current liabilities (5) (52)
Non-current liabilities (3) (14)
Cash flow hedges | Foreign currency exchange risk | Derivatives assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 61 8
Current assets 57 1
Non-current assets 4 7
Cash flow hedges | Commodity price risk | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities   (10)
Current liabilities   (9)
Non-current liabilities   (1)
Cash flow hedges | Commodity price risk | Derivatives assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 16 1
Current assets 14 1
Non-current assets 2 0
Net investment hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (7,780) (9,127)
Fair value through income statement    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (707) (561)
Fair value through income statement | Trade and other payables    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (429) (249)
Fair value through income statement | Other instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (176) (236)
Fair value through income statement | Total other financial liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (278) (312)
Fair value through income statement | Fair value hedges | Interest rate risk | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (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 (8) (66)
Fair value through income statement | Cash flow hedges | Commodity price risk | Derivative liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities   (10)
Liabilities at amortised cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (18,761) (19,997)
Liabilities at amortised cost | Borrowings    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (14,727) (16,785)
Liabilities at amortised cost | Trade and other payables    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (3,580) (2,742)
Liabilities at amortised cost | Other instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (91) 0
Liabilities at amortised cost | Leases    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (363) (470)
Liabilities at amortised cost | Total other financial liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (454) (470)
Not categorised as a financial instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (977) (867)
Not categorised as a financial instrument | Trade and other payables    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (977) (867)
Fair value through income statement    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 564 854
Fair value through income statement | Other investments and loans    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 121 96
Fair value through income statement | Other instruments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 55 91
Fair value through income statement | Total other financial assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 443 758
Fair value through income statement | Fair value hedges | Interest rate risk | Derivatives assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 106 189
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 205 469
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 61 8
Fair value through income statement | Cash flow hedges | Commodity price risk | Derivatives assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 16 1
Fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 17 20
Fair value through other comprehensive income | Other investments and loans    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 17 20
Assets at amortised cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 4,779 5,115
Assets at amortised cost | Other investments and loans    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 8 5
Assets at amortised cost | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,017 1,784
Assets at amortised cost | Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,749 3,323
Assets at amortised cost | Leases    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 5 3
Assets at amortised cost | Total other financial assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 5 3
Not categorised as a financial instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 406 375
Not categorised as a financial instrument | Other investments and loans    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2 2
Not categorised as a financial instrument | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 404 373
Fair value through income statement    
Disclosure of detailed information about financial instruments [line items]    
Total net financial assets/(liabilities) (143) 293
Fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Total net financial assets/(liabilities) 17 20
Assets and liabilities at amortised cost    
Disclosure of detailed information about financial instruments [line items]    
Total net financial assets/(liabilities) (13,982) (14,882)
Not categorised as a financial instrument    
Disclosure of detailed information about financial instruments [line items]    
Total net financial assets/(liabilities) £ (571) £ (492)