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Investments in associates and joint ventures - Disclosure of investments in associates and joint ventures (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of associates [line items]    
Investments in associates accounted for using equity method £ 14 £ 14
Investments in joint ventures accounted for using equity method 0 0
Total investments accounted for using equity method 14 14
Barclays Bank PLC    
Disclosure of associates [line items]    
Investments in associates accounted for using equity method 12 12
Investments in joint ventures accounted for using equity method 0 0
Total investments accounted for using equity method £ 12 £ 12