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Share capital and other equity - Movement in shares (Details) - GBP (£)
shares in Thousands, £ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Value of shares    
Equity at beginning of period £ 37,188 £ 36,496
Ordinary shares issued 1,390  
Equity at end of period 39,378 37,188
Ordinary shares    
Value of shares    
Equity at beginning of period 9,683 10,539
Shares cancellation (711) (856)
Equity at end of period £ 8,972 £ 9,683
Number of shares    
At 1 January 8,991,737 9,786,024
Shares cancellation (660,592) (794,287)
At 31 December 8,331,145 8,991,737