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Financial instruments and risk management - Schedule of contractual cash flows (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure about contractual cash flows [line items]    
Borrowings £ (16,502) £ (16,020)
Interest on borrowings (217) (141)
Lease capital repayments (448) (475)
Lease future interest payments 0 0
Trade and other financial liabilities (4,782) (5,145)
Non-derivative financial liabilities (21,949) (21,781)
Other derivative instruments (net)
Derivative instruments 134 22
Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (1,701) (1,522)
Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (3,522) (2,817)
Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,874) (2,625)
Due after five years    
Disclosure about contractual cash flows [line items]    
Borrowings (8,405) (9,056)
Cross currency swaps (gross)    
Disclosure about contractual cash flows [line items]    
Receivable
Payable
Undiscounted amount    
Disclosure about contractual cash flows [line items]    
Borrowings (16,954) (16,380)
Interest on borrowings (3,417) (3,235)
Lease capital repayments (448) (475)
Lease future interest payments (102) (93)
Trade and other financial liabilities (4,866) (5,156)
Non-derivative financial liabilities (25,787) (25,339)
Other derivative instruments (net) (202) (352)
Derivative instruments 286 268
Undiscounted amount | Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (1,707) (1,524)
Interest on borrowings (541) (427)
Lease capital repayments (75) (85)
Lease future interest payments (18) (13)
Trade and other financial liabilities (4,417) (4,765)
Non-derivative financial liabilities (6,758) (6,814)
Other derivative instruments (net) 19 (86)
Derivative instruments 34 (18)
Undiscounted amount | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (3,615) (2,842)
Interest on borrowings (750) (626)
Lease capital repayments (104) (107)
Lease future interest payments (28) (20)
Trade and other financial liabilities (231) (123)
Non-derivative financial liabilities (4,728) (3,718)
Other derivative instruments (net) (88) (123)
Derivative instruments (57) (89)
Undiscounted amount | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (2,980) (2,738)
Interest on borrowings (623) (560)
Lease capital repayments (69) (61)
Lease future interest payments (19) (16)
Trade and other financial liabilities (122) (142)
Non-derivative financial liabilities (3,813) (3,517)
Other derivative instruments (net) (79) (78)
Derivative instruments (48) (44)
Undiscounted amount | Due after five years    
Disclosure about contractual cash flows [line items]    
Borrowings (8,652) (9,276)
Interest on borrowings (1,503) (1,622)
Lease capital repayments (200) (222)
Lease future interest payments (37) (44)
Trade and other financial liabilities (96) (126)
Non-derivative financial liabilities (10,488) (11,290)
Other derivative instruments (net) (54) (65)
Derivative instruments 357 419
Undiscounted amount | Cross currency swaps (gross)    
Disclosure about contractual cash flows [line items]    
Receivable 1,558 2,473
Payable (1,070) (1,853)
Undiscounted amount | Cross currency swaps (gross) | Within one year    
Disclosure about contractual cash flows [line items]    
Receivable 43 851
Payable (28) (783)
Undiscounted amount | Cross currency swaps (gross) | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Receivable 87 90
Payable (56) (56)
Undiscounted amount | Cross currency swaps (gross) | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Receivable 87 90
Payable (56) (56)
Undiscounted amount | Cross currency swaps (gross) | Due after five years    
Disclosure about contractual cash flows [line items]    
Receivable 1,341 1,442
Payable £ (930) £ (958)