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Financial instruments and risk management - Contractual cash flows (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure about contractual cash flows [line items]    
Borrowings £ (14,727) £ (16,785)
Interest on borrowings (122) (148)
Lease capital repayments (363) (470)
Lease future interest payments 0 0
Trade and other financial liabilities (4,125) (3,006)
Non-derivative financial liabilities (19,337) (20,409)
Other derivative instruments (net) 0 0
Derivative instruments 312 610
Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (1,862) (1,995)
Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,623) (3,013)
Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,788) (3,134)
After five years    
Disclosure about contractual cash flows [line items]    
Borrowings (7,454) (8,643)
Cross currency swaps (gross)    
Disclosure about contractual cash flows [line items]    
Receivable 0 0
Payable 0 0
Undiscounted amount    
Disclosure about contractual cash flows [line items]    
Borrowings (14,735) (16,669)
Interest on borrowings (2,784) (3,417)
Lease capital repayments (363) (470)
Lease future interest payments (54) (62)
Trade and other financial liabilities (4,170) (3,043)
Non-derivative financial liabilities (22,106) (23,661)
Other derivative instruments (net) 174 174
Derivative instruments 490 801
Undiscounted amount | Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (1,859) (1,994)
Interest on borrowings (390) (466)
Lease capital repayments (82) (106)
Lease future interest payments (9) (9)
Trade and other financial liabilities (3,800) (2,833)
Non-derivative financial liabilities (6,140) (5,408)
Other derivative instruments (net) 143 21
Derivative instruments 159 45
Undiscounted amount | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,590) (2,980)
Interest on borrowings (552) (669)
Lease capital repayments (92) (135)
Lease future interest payments (12) (13)
Trade and other financial liabilities (71) (127)
Non-derivative financial liabilities (3,317) (3,924)
Other derivative instruments (net) 54 89
Derivative instruments 23 167
Undiscounted amount | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,788) (3,080)
Interest on borrowings (467) (541)
Lease capital repayments (45) (71)
Lease future interest payments (8) (9)
Trade and other financial liabilities (108) (48)
Non-derivative financial liabilities (3,416) (3,749)
Other derivative instruments (net) 0 45
Derivative instruments 23 78
Undiscounted amount | After five years    
Disclosure about contractual cash flows [line items]    
Borrowings (7,498) (8,615)
Interest on borrowings (1,375) (1,741)
Lease capital repayments (144) (158)
Lease future interest payments (25) (31)
Trade and other financial liabilities (191) (35)
Non-derivative financial liabilities (9,233) (10,580)
Other derivative instruments (net) (23) 19
Derivative instruments 285 511
Undiscounted amount | Cross currency swaps (gross)    
Disclosure about contractual cash flows [line items]    
Receivable 2,210 2,562
Payable (1,894) (1,935)
Undiscounted amount | Cross currency swaps (gross) | Within one year    
Disclosure about contractual cash flows [line items]    
Receivable 57 65
Payable (41) (41)
Undiscounted amount | Cross currency swaps (gross) | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Receivable 780 902
Payable (811) (824)
Undiscounted amount | Cross currency swaps (gross) | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Receivable 79 89
Payable (56) (56)
Undiscounted amount | Cross currency swaps (gross) | After five years    
Disclosure about contractual cash flows [line items]    
Receivable 1,294 1,506
Payable £ (986) £ (1,014)