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Financial instruments: valuation - Hierarchy of liabilities (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair value of liabilities        
Financial liabilities £ 667,803 £ 683,557    
Financial liabilities at amortised cost        
Fair value of liabilities        
Financial liabilities 527,869 529,839    
Derivatives [Member]        
Fair value of liabilities        
Financial liabilities 77,246 94,047    
Financial liabilities (other)        
Fair value of liabilities        
Financial liabilities 55,748 49,107    
Financial liabilities (other) | Financial liabilities at amortised cost        
Fair value of liabilities        
Financial liabilities 53,340 46,730    
Financial liabilities, subordinated        
Fair value of liabilities        
Financial liabilities 6,020 6,260    
Financial liabilities, subordinated | Financial liabilities at amortised cost        
Fair value of liabilities        
Financial liabilities 5,803 5,915    
At fair value        
Fair value of liabilities        
Financial liabilities 136,053 149,577    
At fair value | Trading deposits        
Fair value of liabilities        
Financial liabilities 44,257 42,487    
At fair value | Debt securities in issue, trading        
Fair value of liabilities        
Financial liabilities 714 797    
At fair value | Short positions, trading        
Fair value of liabilities        
Financial liabilities 11,211 9,524    
At fair value | Derivatives [Member]        
Fair value of liabilities        
Financial liabilities 77,246 94,047    
At fair value | Other financial liabilities - Debt securities in issue        
Fair value of liabilities        
Financial liabilities 1,323 1,327    
At fair value | Other deposits        
Fair value of liabilities        
Financial liabilities 1,085 1,050    
At fair value | Financial liabilities, subordinated        
Fair value of liabilities        
Financial liabilities 217 345    
At fair value | Level 1        
Fair value of liabilities        
Financial liabilities £ 9,143 £ 7,464    
As a % of total value assets 7.00% 5.00%    
At fair value | Level 1 | Short positions, trading        
Fair value of liabilities        
Financial liabilities £ 9,142 £ 7,462    
At fair value | Level 1 | Derivatives [Member]        
Fair value of liabilities        
Financial liabilities 1 2    
At fair value | Level 2        
Fair value of liabilities        
Financial liabilities £ 126,013 £ 141,137    
As a % of total value assets 92.00% 94.00%    
At fair value | Level 2 | Trading deposits        
Fair value of liabilities        
Financial liabilities £ 44,256 £ 42,486    
At fair value | Level 2 | Debt securities in issue, trading        
Fair value of liabilities        
Financial liabilities 713 797    
At fair value | Level 2 | Short positions, trading        
Fair value of liabilities        
Financial liabilities 2,069 2,062    
At fair value | Level 2 | Derivatives [Member]        
Fair value of liabilities        
Financial liabilities 76,350 93,070    
At fair value | Level 2 | Other financial liabilities - Debt securities in issue        
Fair value of liabilities        
Financial liabilities 1,323 1,327    
At fair value | Level 2 | Other deposits        
Fair value of liabilities        
Financial liabilities 1,085 1,050    
At fair value | Level 2 | Financial liabilities, subordinated        
Fair value of liabilities        
Financial liabilities 217 345    
At fair value | Level 3        
Fair value of liabilities        
Financial liabilities £ 897 £ 976 £ 751 £ 609
As a % of total value assets 1.00% 1.00%    
At fair value | Level 3 | Trading deposits        
Fair value of liabilities        
Financial liabilities £ 1 £ 1    
At fair value | Level 3 | Debt securities in issue, trading        
Fair value of liabilities        
Financial liabilities 1      
At fair value | Level 3 | Derivatives [Member]        
Fair value of liabilities        
Financial liabilities £ 895 £ 975