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 £ 5,577 £ 5,360
Other non-contract fee income 79 69
Fee and commission income 5,656 5,429
Fee and commission expense (1,972) (1,691)
Net fee and commission income 3,684 3,738
Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 2,496 2,461
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 1,158 945
Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 1,460 1,454
Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 15 19
Operating segments | Barclays UK    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 732 688
Other non-contract fee income 0 0
Fee and commission income 732 688
Fee and commission expense (242) (177)
Net fee and commission income 490 511
Operating segments | Barclays UK | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 608 551
Operating segments | Barclays UK | Advisory    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 0 0
Operating segments | Barclays UK | Brokerage and execution    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 100 107
Operating segments | Barclays UK | Underwriting and syndication    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 18 17
Operating segments | Barclays UK | Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 6 13
Operating segments | Barclays UK Corporate Bank    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 280 278
Other non-contract fee income 14 11
Fee and commission income 294 289
Fee and commission expense (46) (43)
Net fee and commission income 248 246
Operating segments | Barclays UK Corporate Bank | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 229 232
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 0 0
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 260 234
Other non-contract fee income 0 0
Fee and commission income 260 234
Fee and commission expense (18) (19)
Net fee and commission income 242 215
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 0 0
Operating segments | Barclays Investment Bank    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 2,823 2,663
Other non-contract fee income 65 58
Fee and commission income 2,888 2,721
Fee and commission expense (675) (516)
Net fee and commission income 2,213 2,205
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 979 776
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 0 0
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 149 177
Other non-contract fee income 0 0
Fee and commission income 149 177
Fee and commission expense (32) (43)
Net fee and commission income 117 134
Head Office | Transactional    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Total revenue from contracts with customers 140 171
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 £ 9 £ 6