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Financial instruments and risk management - Schedule of contractual cash flows (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure about contractual cash flows [line items]    
Borrowings £ (16,020) £ (14,727)
Interest on borrowings (141) (122)
Lease capital repayments (475) (363)
Lease future interest payments 0 0
Trade and other financial liabilities (5,145) (4,125)
Non-derivative financial liabilities (21,781) (19,337)
Other derivative instruments (net) 0 0
Derivative instruments 22 312
Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (1,522) (1,862)
Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,817) (2,623)
Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,625) (2,788)
Due after five years    
Disclosure about contractual cash flows [line items]    
Borrowings (9,056) (7,454)
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 (16,380) (14,735)
Interest on borrowings (3,235) (2,784)
Lease capital repayments (475) (363)
Lease future interest payments (93) (54)
Trade and other financial liabilities (5,156) (4,170)
Non-derivative financial liabilities (25,339) (22,106)
Other derivative instruments (net) (352) 174
Derivative instruments 268 490
Undiscounted amount | Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (1,524) (1,859)
Interest on borrowings (427) (390)
Lease capital repayments (85) (82)
Lease future interest payments (13) (9)
Trade and other financial liabilities (4,765) (3,800)
Non-derivative financial liabilities (6,814) (6,140)
Other derivative instruments (net) (86) 143
Derivative instruments (18) 159
Undiscounted amount | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,842) (2,590)
Interest on borrowings (626) (552)
Lease capital repayments (107) (92)
Lease future interest payments (20) (12)
Trade and other financial liabilities (123) (71)
Non-derivative financial liabilities (3,718) (3,317)
Other derivative instruments (net) (123) 54
Derivative instruments (89) 23
Undiscounted amount | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,738) (2,788)
Interest on borrowings (560) (467)
Lease capital repayments (61) (45)
Lease future interest payments (16) (8)
Trade and other financial liabilities (142) (108)
Non-derivative financial liabilities (3,517) (3,416)
Other derivative instruments (net) (78) 0
Derivative instruments (44) 23
Undiscounted amount | Due after five years    
Disclosure about contractual cash flows [line items]    
Borrowings (9,276) (7,498)
Interest on borrowings (1,622) (1,375)
Lease capital repayments (222) (144)
Lease future interest payments (44) (25)
Trade and other financial liabilities (126) (191)
Non-derivative financial liabilities (11,290) (9,233)
Other derivative instruments (net) (65) (23)
Derivative instruments 419 285
Undiscounted amount | Cross currency swaps (gross)    
Disclosure about contractual cash flows [line items]    
Receivable 2,473 2,210
Payable (1,853) (1,894)
Undiscounted amount | Cross currency swaps (gross) | Within one year    
Disclosure about contractual cash flows [line items]    
Receivable 851 57
Payable (783) (41)
Undiscounted amount | Cross currency swaps (gross) | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Receivable 90 780
Payable (56) (811)
Undiscounted amount | Cross currency swaps (gross) | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Receivable 90 79
Payable (56) (56)
Undiscounted amount | Cross currency swaps (gross) | Due after five years    
Disclosure about contractual cash flows [line items]    
Receivable 1,442 1,294
Payable £ (958) £ (986)