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Derivative financial instruments - Cash flow hedge - Narrative (Details)
€ in Millions, £ in Millions
12 Months Ended
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Derivative financial instruments          
Net gain (loss) on cash flow hedge | £ [1] £ (6) £ 13 £ (5)    
Cash flow hedge          
Derivative financial instruments          
Hedge ratio 1        
Gain or (loss) due to ineffectiveness | £ £ 21 (1)      
Net gain (loss) on cash flow hedge | £ (6) 13      
Gain in hedge reserves related to continuing hedges | £ 3 9      
Gain in hedge reserves related to discontinued hedges | £ £ 0 £ 0      
€400m bond maturing in 2024 | Cash flow hedge          
Derivative financial instruments          
Amount of hedged item       € 400 € 340
Principal amount       400  
€500m bond maturing in 2026 | Cash flow hedge          
Derivative financial instruments          
Amount of hedged item       500 179
Principal amount       500  
€850m bond maturing in 2027 | Cash flow hedge          
Derivative financial instruments          
Amount of hedged item       421 0
Principal amount       850  
€600m bond maturing in 2028 | Cash flow hedge          
Derivative financial instruments          
Amount of hedged item       600 € 175
Principal amount       € 600  
[1] £6m net loss (2021: £13m net gain; 2020: £5m net loss) on cash flow hedge includes £137m gain (2021: £15m loss; 2020: £15m gain) from the effective portion of changes in fair value offset by reclassification to the cost of acquisition of £118m gain (2021: £nil; 2020: £nil) and reclassification to the income statement of £25m gain (2021: £28m loss; 2020: £20m gain) due to changes in foreign exchange rates.