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Financial instruments - Hierarchy of liabilities (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Fair value of liabilities        
Financial liabilities £ 767,851 £ 740,189    
Financial liabilities at amortised cost        
Fair value of liabilities        
Financial liabilities 584,673 567,941    
Derivatives [Member]        
Fair value of liabilities        
Financial liabilities 102,719 100,835    
Financial liabilities (other)        
Fair value of liabilities        
Financial liabilities 47,744 49,326    
Financial liabilities (other) | Financial liabilities at amortised cost        
Fair value of liabilities        
Financial liabilities 45,965 47,655    
Financial liabilities, subordinated        
Fair value of liabilities        
Financial liabilities 8,110 8,429    
Financial liabilities, subordinated | Financial liabilities at amortised cost        
Fair value of liabilities        
Financial liabilities 7,770 7,726    
At fair value        
Fair value of liabilities        
Financial liabilities 179,183 167,807    
At fair value | Trading deposits        
Fair value of liabilities        
Financial liabilities 48,781 38,660    
At fair value | Debt securities in issue, trading        
Fair value of liabilities        
Financial liabilities 803 974    
At fair value | Short positions, trading        
Fair value of liabilities        
Financial liabilities 24,761 24,964    
At fair value | Derivatives [Member]        
Fair value of liabilities        
Financial liabilities 102,719 100,835    
At fair value | Other financial liabilities - Debt securities in issue        
Fair value of liabilities        
Financial liabilities 1,237 1,103    
At fair value | Other deposits        
Fair value of liabilities        
Financial liabilities 542 568    
At fair value | Financial liabilities, subordinated        
Fair value of liabilities        
Financial liabilities 340 703    
At fair value | Level 1        
Fair value of liabilities        
Financial liabilities £ 22,022 £ 20,507    
As % of Total FV Assets 12.00% 12.00%    
At fair value | Level 1 | Short positions, trading        
Fair value of liabilities        
Financial liabilities £ 22,022 £ 20,507    
At fair value | Level 2        
Fair value of liabilities        
Financial liabilities £ 156,410 £ 146,691    
As % of Total FV Assets 88.00% 88.00%    
At fair value | Level 2 | Trading deposits        
Fair value of liabilities        
Financial liabilities £ 48,780 £ 38,658    
At fair value | Level 2 | Debt securities in issue, trading        
Fair value of liabilities        
Financial liabilities 801 974    
At fair value | Level 2 | Short positions, trading        
Fair value of liabilities        
Financial liabilities 2,738 4,456    
At fair value | Level 2 | Derivatives [Member]        
Fair value of liabilities        
Financial liabilities 101,972 100,229    
At fair value | Level 2 | Other financial liabilities - Debt securities in issue        
Fair value of liabilities        
Financial liabilities 1,237 1,103    
At fair value | Level 2 | Other deposits        
Fair value of liabilities        
Financial liabilities 542 568    
At fair value | Level 2 | Financial liabilities, subordinated        
Fair value of liabilities        
Financial liabilities 340 703    
At fair value | Level 3        
Fair value of liabilities        
Financial liabilities £ 751 £ 609 £ 685 £ 894
As % of Total FV Assets 0.00% 0.00%    
At fair value | Level 3 | Trading deposits        
Fair value of liabilities        
Financial liabilities £ 1 £ 2    
At fair value | Level 3 | Debt securities in issue, trading        
Fair value of liabilities        
Financial liabilities 2      
At fair value | Level 3 | Short positions, trading        
Fair value of liabilities        
Financial liabilities 1 1    
At fair value | Level 3 | Derivatives [Member]        
Fair value of liabilities        
Financial liabilities £ 747 £ 606