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Operating expenses - Bonus awards - Actual and Expected (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating expenses      
Bonus awards deferred from 2019 and earlier £ 28 £ 114 £ 127
Bonus awards deferred from 2020 52    
Less: forfeiture of amounts deferred from prior years (15) (11) (25)
Income statement charge for amounts deferred from prior years 65 £ 103 £ 102
Not later than one year [member]      
Operating expenses      
Bonus awards deferred from 2019 and earlier 11    
Bonus awards deferred from 2020 8    
Bonus awards for 2021 deferred 86    
Income statement charge for amounts deferred from prior years 105    
Later than one year [member]      
Operating expenses      
Bonus awards deferred from 2019 and earlier 6    
Bonus awards deferred from 2020 7    
Bonus awards for 2021 deferred 13    
Income statement charge for amounts deferred from prior years £ 26