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Financial instruments: valuation - Liabilities at Amortised Cost (Details) - GBP (£)
£ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair value of liabilities        
Financial Liabilities £ 652,775 £ 655,485    
Amortised cost        
Fair value of liabilities        
Financial Liabilities 530,453 521,875    
Deposits by banks        
Fair value of liabilities        
Financial Liabilities 25,626 22,190    
Deposits by banks | Amortised cost        
Fair value of liabilities        
Financial Liabilities 25,626 22,190    
Customer deposits        
Fair value of liabilities        
Financial Liabilities 432,975 431,377    
Customer deposits | Amortised cost        
Fair value of liabilities        
Financial Liabilities 432,975 431,377    
Settlement balances liabilities        
Fair value of liabilities        
Financial Liabilities 7,142 6,645    
Settlement balances liabilities | Amortised cost        
Fair value of liabilities        
Financial Liabilities 7,142 6,645    
Financial liabilities (other)        
Fair value of liabilities        
Financial Liabilities 58,275 55,089    
Financial liabilities (other) | Amortised cost        
Fair value of liabilities        
Financial Liabilities 54,987 52,201    
Debt securities in issue | Amortised cost        
Fair value of liabilities        
Financial Liabilities 55,000 52,200    
Financial liabilities, subordinated        
Fair value of liabilities        
Financial Liabilities 6,032 5,714    
Financial liabilities, subordinated | Amortised cost        
Fair value of liabilities        
Financial Liabilities 5,803 5,477    
Notes in circulation        
Fair value of liabilities        
Financial Liabilities 3,254 3,237    
Notes in circulation | Amortised cost        
Fair value of liabilities        
Financial Liabilities 3,254 3,237    
Items where fair value approximates carrying value | Deposits by banks | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 4,400 4,200    
Items where fair value approximates carrying value | Customer deposits | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 352,900 351,500    
Items where fair value approximates carrying value | Settlement balances liabilities | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 7,100 6,600    
Items where fair value approximates carrying value | Notes in circulation | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 3,300 3,200    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Deposits by banks | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 25,600 22,300    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Deposits by banks | Level 2 | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 17,500 15,400    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Deposits by banks | Level 3 | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 3,700 2,700    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Customer deposits | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 432,600 431,000    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Customer deposits | Level 2 | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 29,900 30,700    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Customer deposits | Level 3 | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 49,800 48,800    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Settlement balances liabilities | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 7,100 6,600    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Debt securities in issue | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 55,000 52,200    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Debt securities in issue | Level 2 | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 45,000 41,700    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Debt securities in issue | Level 3 | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 10,000 10,500    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Financial liabilities, subordinated | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 5,800 5,400    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Financial liabilities, subordinated | Level 2 | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 5,800 5,400    
Not measured at fair value in statement of financial position but for which fair value is disclosed | Notes in circulation | Amortised cost        
Fair value of liabilities        
Fair value, Financial Liabilities 3,300 3,200    
At fair value        
Fair value of liabilities        
Fair value, Financial Liabilities 118,533 129,156    
At fair value | Level 1        
Fair value of liabilities        
Fair value, Financial Liabilities 7,843 7,936    
At fair value | Level 2        
Fair value of liabilities        
Fair value, Financial Liabilities 110,004 120,529    
At fair value | Level 3        
Fair value of liabilities        
Fair value, Financial Liabilities 686 691 £ 897 £ 976
At fair value | Financial liabilities (other) | Level 3        
Fair value of liabilities        
Fair value, Financial Liabilities 26 3    
At fair value | Financial liabilities, subordinated        
Fair value of liabilities        
Fair value, Financial Liabilities 229 237    
At fair value | Financial liabilities, subordinated | Level 2        
Fair value of liabilities        
Fair value, Financial Liabilities £ 229 £ 237