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Financial instruments: valuation - Hierarchy of assets (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair value of assets      
Assets £ 202,880 £ 280,855  
Trading loans      
Fair value of assets      
Assets 34,203 39,775  
Trading securities      
Fair value of assets      
Assets 24,955 29,215  
Derivatives [Member]      
Fair value of assets      
Assets 106,139 166,523  
Other loans      
Fair value of assets      
Assets 566 353  
Securities      
Fair value of assets      
Assets 37,017 44,989  
Level 1      
Fair value of assets      
Assets £ 48,443 £ 57,507  
As % of Total Fair Value Assets 24.00% 20.00%  
Level 1 | Trading securities      
Fair value of assets      
Assets £ 19,563 £ 21,535  
Level 1 | Securities      
Fair value of assets      
Assets 28,880 35,972  
Level 2      
Fair value of assets      
Assets £ 152,385 £ 221,625  
As % of Total Fair Value Assets 75.00% 79.00%  
Level 2 | Trading loans      
Fair value of assets      
Assets £ 33,482 £ 39,550  
Level 2 | Trading securities      
Fair value of assets      
Assets 5,371 7,599  
Level 2 | Derivatives [Member]      
Fair value of assets      
Assets 105,222 165,441  
Level 2 | Other loans      
Fair value of assets      
Assets 359 185  
Level 2 | Securities      
Fair value of assets      
Assets 7,951 8,850  
Level 3      
Fair value of assets      
Assets £ 2,052 £ 1,723  
As % of Total Fair Value Assets 1.00% 1.00%  
Level 3 | Trading loans      
Fair value of assets      
Assets £ 721 £ 225  
Level 3 | Trading securities      
Fair value of assets      
Assets 21 81  
Level 3 | Derivatives [Member]      
Fair value of assets      
Assets 917 1,082  
Level 3 | Other loans      
Fair value of assets      
Assets 207 168  
Level 3 | Securities      
Fair value of assets      
Assets 186 167  
Recurring | Level 3      
Fair value of assets      
Assets £ 2,052 £ 1,723 £ 2,554