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Insurance service expenses and other expenditure - Fair value of options and awards (Details)
 12 Months Ended
Dec. 31, 2024
GBP (£)
entity
Y
£ / shares
Dec. 31, 2024
GBP (£)
entity
Y
$ / shares
Dec. 31, 2023
GBP (£)
Y
£ / shares
Dec. 31, 2023
GBP (£)
Y
$ / shares
Dec. 31, 2022
GBP (£)
Y
£ / shares
Dec. 31, 2022
GBP (£)
Y
$ / shares
Dec. 31, 2024
HKD ($)
Dec. 31, 2023
HKD ($)
Dec. 31, 2022
HKD ($)
Share-based payment                  
Volatility assumption - number of competitors in basket | entity 12 12              
Volatility assumption - average volatility for basket of competitors (as a percent) 27.00% 27.00% 26.00% 26.00% 26.00% 26.00%      
Volatility assumption - period of correlations for basket of competitors 3 years 3 years              
Sharesave and ISSOSNE                  
Share-based payment                  
Dividend yield (as a percent) 2.08% 2.08% 1.38% 1.38% 1.11% 1.11%      
Expected volatility (as a percent) 28.17% 28.17% 30.02% 30.02% 25.68% 25.68%      
Risk-free interest rate (as a percent) 3.57% 3.57% 4.55% 4.55% 3.97% 3.97%      
Expected option life (years) | Y 4.03 4.03 3.95 3.95 4.52 4.52      
Weighted average exercise price | £ / shares £ 5.24   £ 7.75   £ 7.37        
Weighted average share price at grant date | £ / shares £ 7.16   £ 8.89   £ 9.54        
Weighted average fair value at grant date | £ £ 2.5 £ 2.5 £ 2.85 £ 2.85 £ 3.45 £ 3.45      
Prudential LTIP (TSR)                  
Share-based payment                  
Expected volatility (as a percent) 28.45% 28.45% 31.50% 31.50% 33.64% 33.64%      
Risk-free interest rate (as a percent) 4.39% 4.39% 4.34% 4.34% 2.79% 2.79%      
Weighted average share price at grant date | $ / shares   £ 75.1   £ 112.76   £ 113.83      
Weighted average fair value at grant date | $             $ 29.29 $ 49.6 $ 21.32
Other awards                  
Share-based payment                  
Weighted average fair value at grant date | $             $ 72.58 $ 111.97 $ 113.81