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Financial instruments: valuation - Movement in Level 3 portfolios - Liabilities (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Movement in level 3 liabilities    
Liabilities at beginning of period £ 236,157  
Liabilities at end of period 167,807 £ 236,157
Level 3    
Movement in level 3 liabilities    
Liabilities at beginning of period 894  
Liabilities at end of period 609 894
Leveraged finance loan 450  
Level 3 | Other operating income and interest income    
Movement in level 3 liabilities    
Net gain (loss) on trading assets and liabilities recorded in income from trading activities   (194)
Level 3 | Income from trading activities    
Movement in level 3 liabilities    
Net gain (loss) on trading assets and liabilities recorded in income from trading activities 3  
Recurring | Level 3    
Movement in level 3 liabilities    
Liabilities at beginning of period 894 1,317
Amounts recorded in the income statement (90) (67)
Level 3 transfers in 20 188
Level 3 transfers out (168) (368)
Purchases/Originations 305 127
Settlements/Other decreases (28) (59)
Sales (321) (245)
Foreign exchange and other adjustments (3) 1
Liabilities at end of period 609 894
Recurring | Level 3 | Financial liabilities    
Movement in level 3 liabilities    
Amounts recorded in the income statement in respect of balances held at year end - unrealised £ (90) £ (68)