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Ordinary dividends - Summary of Ordinary Dividends (Details) - GBP (£)
£ / shares in Units, £ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Dividends [line items]      
Amounts recognised as distributions to equity holders, per share £ 0.394 £ 0.394 £ 0.337
Amounts recognised as distributions to equity holders £ 425 £ 423 £ 365
Previous period final amount      
Disclosure of Dividends [line items]      
Amounts recognised as distributions to equity holders, per share £ 0.244 £ 0.244 £ 0.187
Amounts recognised as distributions to equity holders £ 263 £ 262 £ 203
Interim period amount      
Disclosure of Dividends [line items]      
Amounts recognised as distributions to equity holders, per share £ 0.150 £ 0.150 £ 0.150
Amounts recognised as distributions to equity holders £ 162 £ 161 £ 162