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Financial instruments: valuation - Level 3 Sensitivities of Assets (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Fair value of assets      
Financial assets, at fair value £ 202,880   £ 162,882
Trading securities [Member]      
Fair value of assets      
Financial assets, at fair value 24,955   9,922
Derivatives [Member]      
Fair value of assets      
Financial assets 106,139   99,545
Financial assets, at fair value 106,139   99,545
Financial assets (Other)      
Fair value of assets      
Financial assets 46,145   30,895
Other loans      
Fair value of assets      
Financial assets, at fair value 566   899
Other equity securities [member]      
Fair value of assets      
Financial assets, at fair value 37,017   16,861
Level 3      
Fair value of assets      
Financial assets, at fair value 2,052 £ 1,723 2,333
Sensitivity favourable 80 100  
Sensitivity unfavourable 100 110  
Level 3 | Loans      
Fair value of assets      
Financial assets, at fair value 721   395
Sensitivity favourable 10 10  
Sensitivity unfavourable 10 10  
Level 3 | Trading securities [Member]      
Fair value of assets      
Financial assets, at fair value 21   1
Level 3 | Derivatives [Member]      
Fair value of assets      
Financial assets, at fair value 917   1,007
Sensitivity favourable 50 60  
Sensitivity unfavourable 50 70  
Level 3 | Other loans      
Fair value of assets      
Financial assets, at fair value 207   727
Sensitivity favourable   10  
Sensitivity unfavourable 10 10  
Level 3 | Other equity securities [member]      
Fair value of assets      
Financial assets, at fair value 186   £ 203
Sensitivity favourable 20 20  
Sensitivity unfavourable £ 30 £ 20