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Financial instruments: valuation - Assets at Amortised Cost (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair value of assets    
Financial Assets £ 781,992 £ 799,491
Other financial assets - securities 202,880 280,855
Carrying value, Financial liabilities 740,189 755,667
Level 1    
Fair value of assets    
Other financial assets - securities 48,443 57,507
Level 2    
Fair value of assets    
Other financial assets - securities 152,385 221,625
Level 3    
Fair value of assets    
Other financial assets - securities 2,052 1,723
Cash and balances at central banks    
Fair value of assets    
Financial Assets 177,757 124,489
Loans and advances to banks | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 7,682 6,955
Loans and advances to customers | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 358,990 360,544
Securities    
Fair value of assets    
Other financial assets - securities 37,017 44,989
Securities | Level 1    
Fair value of assets    
Other financial assets - securities 28,880 35,972
Securities | Level 2    
Fair value of assets    
Other financial assets - securities 7,951 8,850
Securities | Level 3    
Fair value of assets    
Other financial assets - securities 186 167
Items where fair values approximates carrying value | Cash and balances at central banks | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 177,800 124,500
Items where fair values approximates carrying value | Settlement balances | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 2,100 2,300
Items where fair values approximates carrying value | Loans and advances to banks | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 100 100
Carrying value | Loans and advances to banks | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 7,500 6,900
Carrying value | Loans and advances to customers | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 359,000 360,500
Carrying value | Other financial assets - securities | Financial assets at amortised cost    
Fair value of assets    
Financial Assets 8,600 9,800
At fair value | Loans and advances to banks | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 7,500 6,900
At fair value | Loans and advances to banks | Level 2 | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 5,000 3,800
At fair value | Loans and advances to banks | Level 3 | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 2,500 3,100
At fair value | Loans and advances to customers | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 354,100 359,200
At fair value | Loans and advances to customers | Level 2 | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 28,000 25,200
At fair value | Loans and advances to customers | Level 3 | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 326,100 334,000
At fair value | Other financial assets - securities | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 8,600 10,100
At fair value | Other financial assets - securities | Level 1 | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 4,400 5,900
At fair value | Other financial assets - securities | Level 2 | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities 700 1,200
At fair value | Other financial assets - securities | Level 3 | Financial assets at amortised cost    
Fair value of assets    
Other financial assets - securities £ 3,500 £ 3,000