v3.25.2
Net fee and commission income (Details) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers £ 4,883 £ 4,706
Other non-contract fee income 79 69
Fee and commission income 4,962 4,775
Fee and commission expense (1,742) (1,527)
Net fee and commission income 3,220 3,248
Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 1,878 1,895
Advisory    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 448 481
Brokerage and execution    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 1,058 839
Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 1,442 1,437
Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 57 54
Operating segments | Barclays UK Corporate Bank    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 286 280
Other non-contract fee income 14 11
Fee and commission income 300 291
Fee and commission expense (49) (46)
Net fee and commission income 251 245
Operating segments | Barclays UK Corporate Bank | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 229 228
Operating segments | Barclays UK Corporate Bank | Advisory    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Operating segments | Barclays UK Corporate Bank | Brokerage and execution    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Operating segments | Barclays UK Corporate Bank | Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 51 46
Operating segments | Barclays UK Corporate Bank | Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 6 6
Operating segments | Barclays Private Bank and Wealth Management    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 262 236
Other non-contract fee income 0 0
Fee and commission income 262 236
Fee and commission expense (19) (19)
Net fee and commission income 243 217
Operating segments | Barclays Private Bank and Wealth Management | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 15 16
Operating segments | Barclays Private Bank and Wealth Management | Advisory    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 166 156
Operating segments | Barclays Private Bank and Wealth Management | Brokerage and execution    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 79 62
Operating segments | Barclays Private Bank and Wealth Management | Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Operating segments | Barclays Private Bank and Wealth Management | Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 2 2
Operating segments | Barclays Investment Bank    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 2,857 2,699
Other non-contract fee income 65 58
Fee and commission income 2,922 2,757
Fee and commission expense (677) (520)
Net fee and commission income 2,245 2,237
Operating segments | Barclays Investment Bank | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 171 171
Operating segments | Barclays Investment Bank | Advisory    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 282 325
Operating segments | Barclays Investment Bank | Brokerage and execution    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 979 777
Operating segments | Barclays Investment Bank | Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 1,391 1,391
Operating segments | Barclays Investment Bank | Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 34 35
Operating segments | Barclays US Consumer Bank    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 1,333 1,320
Other non-contract fee income 0 0
Fee and commission income 1,333 1,320
Fee and commission expense (959) (893)
Net fee and commission income 374 427
Operating segments | Barclays US Consumer Bank | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 1,333 1,320
Operating segments | Barclays US Consumer Bank | Advisory    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Operating segments | Barclays US Consumer Bank | Brokerage and execution    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Operating segments | Barclays US Consumer Bank | Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Operating segments | Barclays US Consumer Bank | Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Head Office    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 145 171
Other non-contract fee income 0 0
Fee and commission income 145 171
Fee and commission expense (38) (49)
Net fee and commission income 107 122
Head Office | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 130 160
Head Office | Advisory    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Head Office | Brokerage and execution    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Head Office | Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Head Office | Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers £ 15 £ 11