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Financial instruments: valuation - Assets at Amortised Cost (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Financial liabilities (other)    
Fair value of assets    
Carrying value, Financial liabilities £ 55,089 £ 49,107
Cash and balances at central banks    
Fair value of assets    
Financial Assets 104,262 144,832
Cash and balances at central banks | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 104,300 144,800
Settlement balances | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 7,200 2,600
Loans to banks - amortised cost | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 6,914 7,139
Loans to customers - amortised cost | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 381,433 366,340
Other financial assets - securities | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 21,700 13,100
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 104,300 144,800
Items where fair value approximates carrying value | Settlement balances | Financial assets at amortised cost    
Fair value of assets    
Financial Assets, at fair value 7,200 2,600
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 4,200 100
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 104,300 144,800
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 7,200 2,600
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 7,000 7,100
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 2,200 4,200
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 600 2,800
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 373,200 354,500
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 27,500 20,300
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 345,700 334,200
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 21,600 12,800
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 4,000 3,600
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 6,600 3,200
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 £ 11,000 £ 6,000