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Share capital and other equity - Non-cumulative preference shares (Details)
$ / shares in Units, £ in Millions
Mar. 31, 2022
$ / shares
Dec. 31, 2022
GBP (£)
Mar. 30, 2022
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Share capital          
Value of shares | £   £ 36,496   £ 41,803 £ 43,824
Series U Dollar Non-cumulative Preference Shares          
Share capital          
Value of shares | $     $ 1,013,000,000    
Redemption price per share $ 100,000        
Accrued dividends per share $ 635.94