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Net debt - Reconciliation - Additional Information (Details)
£ in Millions
 12 Months Ended
Dec. 31, 2023
GBP (£)
€ / £
Dec. 31, 2023
GBP (£)
$ / £
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Net debt          
Foreign exchange gain (loss) on debt and derivatives     £ 146 £ (74)  
Strengthening (weakening) of currency (0.02) (0.06)      
Cash paid on debt-related foreign exchange forward contracts     3 4  
Cash outflow (decrease) for borrowings     664 (2,378)  
Proceeds from new debt     0 (2,383) £ (5)
Decrease (increase) in overdraft     562 (865)  
Debt repayments     0 844 167
Cash outflow from payment of interest on debt     102 26  
Amount of cash outflow (decrease) for derivatives     39 (7)  
Cash outflow (inflow) on settlement of debt-related foreign exchange forward contracts     3 (26) 19
Cash outflow from payment of interest on derivatives     36 19  
Cash outflow for leases     182 114  
Capital element of lease payments     157 104 88
Interest element of lease payments     25 10 £ 6
Book value £ 3,153 £ 3,153 3,153 3,574  
Bond debt          
Net debt          
Book value 2,943 2,943 2,943 2,987  
Fair market value £ 2,959 £ 2,959 £ 2,959 £ 2,826