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Dividends (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Dividends Declared
All figures in £ millions
   
2021
      2020      2019  
Final paid in respect of prior year 13.5p (2020: 13.5p; 2019: 13.5p)
   
 
102
 
      101        101  
Interim paid in respect of current year 6.3p (2020: 6.0p; 2019: 6.0p)
   
 
47
 
      45        46  
    
 
 
     
 
 
     
 
 
  
    
149
      146      147