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Securitisations - Continuing involvement in financial assets that have been derecognised (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount £ 852 £ 414
Fair value 791 410
Maximum exposure to loss 852 414
Gain from continuing involvement for the year ended 24 9
Gain from continuing involvement, cumulative 41 17
Asset-backed securities    
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount 8 25
Fair value 8 25
Maximum exposure to loss 8 25
Gain from continuing involvement for the year ended 1 1
Gain from continuing involvement, cumulative 3 2
Residential mortgage backed securities    
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount 432 78
Fair value 426 78
Maximum exposure to loss 432 78
Gain from continuing involvement for the year ended 18 3
Gain from continuing involvement, cumulative 22 4
Commercial mortgage backed securities    
Disclosure of continuing involvement in derecognised financial assets [line items]    
Carrying amount 412 311
Fair value 357 307
Maximum exposure to loss 412 311
Gain from continuing involvement for the year ended 5 5
Gain from continuing involvement, cumulative £ 16 £ 11