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Net debt - Reconciliation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net debt    
Opening £ (1,285) £ (1,015)
Cash flows (680) (163)
Non-cash (fair value changes, accruals and acquisitions) (977) (32)
Non-cash (foreign exchange, additions and other) (354) (75)
Closing (3,296) (1,285)
Bank and other short-term borrowings    
Net debt    
Opening (459) (1,591)
Cash flows (121) 1,135
Non-cash (fair value changes, accruals and acquisitions) (771) (12)
Non-cash (foreign exchange, additions and other) (4) 9
Closing (1,355) (459)
Bank and other long-term borrowings    
Net debt    
Opening (1,256) (1,338)
Cash flows (2,257) 15
Non-cash (fair value changes, accruals and acquisitions)   (12)
Non-cash (foreign exchange, additions and other) (61) 79
Closing (3,574) (1,256)
Lease liabilities    
Net debt    
Opening (217) (215)
Cash flows 114 94
Non-cash (fair value changes, accruals and acquisitions) (225) (5)
Non-cash (foreign exchange, additions and other) (139) (91)
Closing (467) (217)
Other Investment    
Net debt    
Opening 1 172
Cash flows   (171)
Closing 1 1
Fair value of debt-related derivatives    
Net debt    
Opening (22) 7
Cash flows (7) 31
Non-cash (fair value changes, accruals and acquisitions) 19 (3)
Non-cash (foreign exchange, additions and other) (61) (57)
Closing (71) (22)
Gross debt    
Net debt    
Opening (1,953) (2,965)
Cash flows (2,271) 1,104
Non-cash (fair value changes, accruals and acquisitions) (977) (32)
Non-cash (foreign exchange, additions and other) (265) (60)
Closing (5,466) (1,953)
Cash and Cash Equivalents    
Net debt    
Opening 668 1,950
Cash flows 1,591 (1,267)
Non-cash (foreign exchange, additions and other) (89) (15)
Closing £ 2,170 £ 668