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Financial instruments: valuation - Movement in Level 3 portfolios - Liabilities (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Derivatives    
Fair value of liabilities    
Financial liabilities at beginning of period £ 94,047  
Financial liabilities at end of period 72,395 £ 94,047
Financial liabilities (other)    
Fair value of liabilities    
Financial liabilities at beginning of period 49,107  
Financial liabilities at end of period 55,089 49,107
Level 3 | Other operating income and interest income | Other financial instruments    
Fair value of liabilities    
Gains Losses Recognised In Profit Or Loss Fair Value measurement Assets and Liabilities 1 (14)
Level 3 | Income from trading activities | Trading assets and liabilities    
Fair value of liabilities    
Gains Losses Recognised In Profit Or Loss Fair Value measurement Assets and Liabilities 69 (224)
Recurring fair value measurement | Level 3    
Fair value of liabilities    
Financial liabilities at beginning of period 976 609
Amounts recorded in the income statement (313) 381
Amount recorded in the statement of comprehensive income 0  
Level 3 transfers in 9 81
Level 3 transfers out (11) (64)
Purchases/Originations 200 382
Settlements/Other decreases (51) (41)
Sales (116) (378)
Foreign exchange and other adjustments (3) 6
Amounts recorded in the income statement in respect of balances held at period end - unrealised (121) 381
Financial liabilities at end of period 691 976
Recurring fair value measurement | Level 3 | Derivatives    
Fair value of liabilities    
Financial liabilities at beginning of period 975 606
Amounts recorded in the income statement (313) 382
Amount recorded in the statement of comprehensive income 0  
Level 3 transfers in 7 78
Level 3 transfers out (9) (61)
Purchases/Originations 195 382
Settlements/Other decreases (51) (41)
Sales (116) (376)
Foreign exchange and other adjustments (3) 5
Amounts recorded in the income statement in respect of balances held at period end - unrealised (121) 382
Financial liabilities at end of period 685 975
Recurring fair value measurement | Level 3 | Other trading liabilities    
Fair value of liabilities    
Financial liabilities at beginning of period 1 3
Amounts recorded in the income statement   (1)
Amount recorded in the statement of comprehensive income 0  
Level 3 transfers in 2 3
Level 3 transfers out (2) (3)
Purchases/Originations 2  
Sales   (2)
Foreign exchange and other adjustments   1
Amounts recorded in the income statement in respect of balances held at period end - unrealised   (1)
Financial liabilities at end of period 3 £ 1
Recurring fair value measurement | Level 3 | Financial liabilities (other)    
Fair value of liabilities    
Amount recorded in the statement of comprehensive income 0  
Purchases/Originations 3  
Financial liabilities at end of period £ 3