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Finance cost - Additional information (Details)
£ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Aug. 31, 2020
GBP (£)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Feb. 28, 2019
USD ($)
Disclosure of detailed information about borrowings              
Interest expense on foreign exchange swaps including coupon interest   £ 26 £ 17        
Interest expense on foreign exchange swaps including coupon interest in other comprehensive income   £ 8 £ 4        
Fair value loss on other derivatives       £ 26      
Synthetic Borrowing Unit              
Disclosure of detailed information about borrowings              
Notional amount | $         $ 335 $ 165 $ 170
Investment interest rate 1.90%            
Fair value loss on other derivatives £ 26