v3.25.4
Principal subsidiaries - Narrative (Details) - GBP (£)
£ in Millions
10 Months Ended 12 Months Ended
Oct. 25, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of subsidiaries [line items]        
Increase (decrease) in investment in subsidiaries   £ (89)    
Assets   1,245,473 £ 1,218,524 £ 1,185,200
Liabilities   1,183,160 1,159,304 1,124,700
Balances with banks and other regulatory authorities   2,775 2,317 £ 2,973
Unconsolidated structured entities        
Disclosure of subsidiaries [line items]        
Proportion of voting rights held in subsidiary 100.00%      
Assets   £ 188,802 189,284  
Barclays Bank Ireland PLC        
Disclosure of subsidiaries [line items]        
Proportion of voting rights held in subsidiary   100.00%    
Total for all subsidiaries        
Disclosure of subsidiaries [line items]        
Assets   £ 582,000 515,000  
Liabilities   559,000 490,000  
Gross exposure        
Disclosure of subsidiaries [line items]        
Investment in subsidiaries   22,996 23,009  
Increase (decrease) in investment in subsidiaries   1    
Accumulated impairment        
Disclosure of subsidiaries [line items]        
Investment in subsidiaries   (2,338) (2,262)  
Increase (decrease) in investment in subsidiaries   (90)    
Accumulated impairment | Barclays Investment Solutions Limited        
Disclosure of subsidiaries [line items]        
Increase (decrease) in investment in subsidiaries   £ (65)    
Accumulated impairment | Barclays Bank Ireland PLC        
Disclosure of subsidiaries [line items]        
Increase (decrease) in investment in subsidiaries     £ 1,000