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Financial instruments - valuation - Assets at Amortised Cost (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Cash and balances at central banks    
Fair value of assets    
Financial Assets £ 92,994 £ 104,262
Cash and balances at central banks | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 93,000 104,300
Settlement balances | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 2,100 7,200
Loans to banks - amortised cost | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 6,030 6,914
Loans to customers - amortised cost | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 400,326 381,433
Other financial assets - securities | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 24,600 21,700
Items where fair value approximates carrying value | Cash and balances at central banks | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 93,000 104,300
Items where fair value approximates carrying value | Settlement balances | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 2,100 7,200
Items where fair value approximates carrying value | Loans to banks - amortised cost | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 3,600 4,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Cash and balances at central banks | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 93,000 104,300
Not measured at fair value in statement of financial position but for which fair value is disclosed | Settlement balances | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 2,100 7,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to banks - amortised cost | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 5,900 7,000
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to banks - amortised cost | Level 2 | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 1,800 2,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to banks - amortised cost | Level 3 | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 500 600
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to customers - amortised cost | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 396,600 373,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to customers - amortised cost | Level 2 | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 34,900 27,500
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to customers - amortised cost | Level 3 | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 361,700 345,700
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 24,600 21,600
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Level 1 | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 4,300 4,000
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Level 2 | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value 12,400 6,600
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Level 3 | Financial assets at amortised cost    
Fair value of assets    
Financial assets, at fair value £ 7,900 £ 11,000