v3.26.1
Segmental reporting (Details) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Disclosure of operating segments [line items]      
Net interest income £ 3,831 £ 3,495  
Non-interest income 8,302 7,587  
Total income 12,133 11,082  
Operating costs (6,635) (6,255)  
UK regulatory levies (40) (53)  
Litigation and conduct (81) (59)  
Operating expenses (6,756) (6,367)  
Profit before Impairment 5,377 4,715  
Credit impairment (charges)/releases (1,057) (875)  
Profit/(loss) before tax 4,320 3,840  
Total assets 1,424,105   £ 1,245,473
Total liabilities 1,359,747   1,183,160
Operating segments | Barclays UK Corporate Bank      
Disclosure of operating segments [line items]      
Net interest income 833 729  
Non-interest income 287 306  
Total income 1,120 1,035  
Operating costs (528) (513)  
UK regulatory levies (15) (24)  
Litigation and conduct 0 (39)  
Operating expenses (543) (576)  
Profit before Impairment 577 459  
Credit impairment (charges)/releases (19) (31)  
Profit/(loss) before tax 558 428  
Total assets 75,800   71,400
Total liabilities 107,400   104,300
Operating segments | Barclays Private Bank and Wealth Management      
Disclosure of operating segments [line items]      
Net interest income 430 425  
Non-interest income 295 292  
Total income 725 717  
Operating costs (546) (494)  
UK regulatory levies (3) (2)  
Litigation and conduct 0 0  
Operating expenses (549) (496)  
Profit before Impairment 176 221  
Credit impairment (charges)/releases (3) 11  
Profit/(loss) before tax 173 232  
Total assets 44,300   41,900
Total liabilities 81,800   80,400
Operating segments | Barclays Investment Bank      
Disclosure of operating segments [line items]      
Net interest income 951 786  
Non-interest income 7,153 6,567  
Total income 8,104 7,353  
Operating costs (4,442) (4,118)  
UK regulatory levies (22) (27)  
Litigation and conduct 2 (11)  
Operating expenses (4,462) (4,156)  
Profit before Impairment 3,642 3,197  
Credit impairment (charges)/releases (323) (139)  
Profit/(loss) before tax 3,319 3,058  
Total assets 1,257,600   1,082,000
Total liabilities 1,140,200   968,100
Operating segments | Barclays US Consumer Bank      
Disclosure of operating segments [line items]      
Net interest income 1,556 1,332  
Non-interest income 564 369  
Total income 2,120 1,701  
Operating costs (837) (817)  
UK regulatory levies 0 0  
Litigation and conduct (2) (3)  
Operating expenses (839) (820)  
Profit before Impairment 1,281 881  
Credit impairment (charges)/releases (713) (711)  
Profit/(loss) before tax 568 170  
Total assets 32,800   34,300
Total liabilities 25,600   25,400
Head Office      
Disclosure of operating segments [line items]      
Net interest income 61 223  
Non-interest income 3 53  
Total income 64 276  
Operating costs (282) (313)  
UK regulatory levies 0 0  
Litigation and conduct (81) (6)  
Operating expenses (363) (319)  
Profit before Impairment (299) (43)  
Credit impairment (charges)/releases 1 (5)  
Profit/(loss) before tax (298) (48)  
Total assets 13,600   15,900
Total liabilities 4,700   £ 5,000
Of which inter-segmental income/(expense)      
Disclosure of operating segments [line items]      
Total income (24) (149)  
Of which inter-segmental income/(expense) | Barclays UK Corporate Bank      
Disclosure of operating segments [line items]      
Total income 796 992  
Of which inter-segmental income/(expense) | Barclays Private Bank and Wealth Management      
Disclosure of operating segments [line items]      
Total income 893 921  
Of which inter-segmental income/(expense) | Barclays Investment Bank      
Disclosure of operating segments [line items]      
Total income (1,656) (1,761)  
Of which inter-segmental income/(expense) | Barclays US Consumer Bank      
Disclosure of operating segments [line items]      
Total income £ (9) £ (3)