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Segmental analysis - Total income (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segmental analysis      
Total income £ 14,703 £ 14,752 £ 13,156
Retail Banking      
Segmental analysis      
Total income 4,743 4,170 4,956
Private Banking      
Segmental analysis      
Total income 26 327 778
Commercial & Institutional      
Segmental analysis      
Total income 8,250 7,730 5,920
Central Items and other      
Segmental analysis      
Total income 1,684 2,525 1,502
Inter-segmental | Retail Banking      
Segmental analysis      
Total income (907) (1,761) (690)
Inter-segmental | Private Banking      
Segmental analysis      
Total income (943) (663) (278)
Inter-segmental | Commercial & Institutional      
Segmental analysis      
Total income 293 309 (493)
Inter-segmental | Central Items and other      
Segmental analysis      
Total income 1,557 2,115 1,461
Operating segment      
Segmental analysis      
Total income 14,703 14,752 13,156
Operating segment | Retail Banking      
Segmental analysis      
Total income 5,650 5,931 5,646
Operating segment | Private Banking      
Segmental analysis      
Total income 969 990 1,056
Operating segment | Commercial & Institutional      
Segmental analysis      
Total income 7,957 7,421 6,413
Operating segment | Central Items and other      
Segmental analysis      
Total income £ 127 £ 410 £ 41