v3.25.4
Securitisations - Disclosure of continuing involvement in financial assets that have been derecognised (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount £ 2,881 £ 3,869
Fair value 2,849 3,824
Maximum exposure to loss 2,955 3,946
Gain from continuing involvement, for the year ended 107 159
Gain from continuing involvement, cumulative to 31 December 362 253
Asset backed securities    
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount 67 53
Fair value 67 53
Maximum exposure to loss 141 130
Gain from continuing involvement, for the year ended 3 1
Gain from continuing involvement, cumulative to 31 December 5 1
Residential mortgage backed securities    
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount 2,454 3,439
Fair value 2,454 3,437
Maximum exposure to loss 2,454 3,439
Gain from continuing involvement, for the year ended 99 155
Gain from continuing involvement, cumulative to 31 December 331 231
Commercial mortgage backed securities    
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount 360 377
Fair value 328 334
Maximum exposure to loss 360 377
Gain from continuing involvement, for the year ended 5 3
Gain from continuing involvement, cumulative to 31 December £ 26 £ 21