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Other financial assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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Other debt securities £ 28,754 £ 16,349
Total debt securities 50,024 29,636
Equity shares 313 360
Loans classified as other financial assets 765 899
Other financial assets 51,102 30,895
Amount of shares acquired 0  
UK    
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Central and local government debt securities 9,330 3,364
USA    
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Central and local government debt securities 6,164 8,112
Countries other than the US and the UK    
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Central and local government debt securities 5,776 1,811
Permanent TSB p.l.c.    
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Amount of shares acquired   146
Disposal of shares 47  
Vodeno Limited    
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Amount of shares acquired   26
VISA    
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Disposal of shares   99
UBS Equity Funds    
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Disposal of shares 35 69
Mandatory fair value through profit or loss    
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Other debt securities 1 2
Total debt securities 1 2
Equity shares 2 3
Loans classified as other financial assets 700 782
Other financial assets 703 787
Designated at fair value    
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Other debt securities 2  
Total debt securities 5  
Other financial assets 5  
Designated at fair value | Countries other than the US and the UK    
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Central and local government debt securities 3  
Fair value through other comprehensive income    
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Other debt securities 10,627 6,765
Total debt securities 28,323 16,499
Equity shares 311 357
Loans classified as other financial assets 65 117
Other financial assets 28,699 16,973
Fair value through other comprehensive income | UK    
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Central and local government debt securities 6,441 802
Fair value through other comprehensive income | USA    
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Central and local government debt securities 5,517 7,175
Fair value through other comprehensive income | Countries other than the US and the UK    
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Central and local government debt securities 5,738 1,757
Amortised cost    
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Other debt securities 18,124 9,582
Total debt securities 21,695 13,135
Other financial assets 21,695 13,135
Amortised cost | UK    
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Central and local government debt securities 2,889 2,562
Amortised cost | USA    
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Central and local government debt securities 647 937
Amortised cost | Countries other than the US and the UK    
Disclosure Of Detailed Information About Hedging Instruments LineItems    
Central and local government debt securities £ 35 £ 54