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Share Plans - Schedule of Movement in Number of Shares held by ESOP Trustees (Details)
12 Months Ended
Dec. 31, 2021
£ / shares
shares
Dec. 31, 2021
$ / shares
Dec. 31, 2020
£ / shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Deferred shares          
Class of Stock [Line Items]          
Common stock, par value (in GBP per share) | £ / shares £ 0.0001   £ 0.0001    
Movement in Number of Shares held by ESOP Trustees [Roll Forward]          
Beginning balance 15,977,968,688        
Shares utilized during the year 0        
Shares transferred into ESOP during the year 0        
Ending balance 15,977,968,688        
Ordinary shares          
Class of Stock [Line Items]          
Common stock, par value (in GBP per share) | (per share) £ 0.50 $ 0.50 £ 0.50 $ 0.50 $ 0.50
Movement in Number of Shares held by ESOP Trustees [Roll Forward]          
Beginning balance 1,013,512        
Shares utilized during the year (242,579)        
Shares transferred into ESOP during the year 67,625        
Ending balance 838,558