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Financial Instruments - classification - Offsetable assets and liabilities (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Instruments which can be offset    
IFRS offset £ 607 £ 733
Potential for offset not recognised by IFRS    
Financial Assets 781,992 799,491
Derivatives [Member]    
Instruments which can be offset    
Gross 4,626 4,811
IFRS offset 607 733
Balance sheet 5,233 5,544
Potential for offset not recognised by IFRS    
Cash collateral (5,126) (4,574)
Securities collateral 485 (132)
Net amount after the effect of netting arrangements and related collateral 592 838
Instruments outside netting arrangements 71 274
Balance sheet total 5,304 5,818
Trading reverse repos/repos    
Instruments which can be offset    
Gross 1,865 1,705
Balance sheet 1,865 1,705
Potential for offset not recognised by IFRS    
Securities collateral (1,795) (1,633)
Net amount after the effect of netting arrangements and related collateral 70 72
Instruments outside netting arrangements (512) (1,337)
Balance sheet total 1,353 368
Non trading reverse repos / repos    
Instruments which can be offset    
Gross 3,682 13,527
Balance sheet 3,682 13,527
Potential for offset not recognised by IFRS    
Securities collateral (3,682) (13,527)
Instruments outside netting arrangements 16  
Balance sheet total 3,698 13,527
Derivatives [Member]    
Instruments which can be offset    
Gross 108,594 171,614
IFRS offset (8,568) (11,540)
Balance sheet 100,026 160,074
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (85,006) (137,086)
Cash collateral (9,909) (15,034)
Other financial collateral (2,913) (4,921)
Net amount after the effect of netting arrangements and related collateral 2,198 3,033
Instruments outside netting arrangements 809 631
Balance sheet total 100,835 160,705
Trading repos    
Instruments which can be offset    
Gross 42,664 42,203
IFRS offset (24,422) (24,867)
Balance sheet 18,242 17,336
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (900) (929)
Other financial collateral (17,341) (16,407)
Net amount after the effect of netting arrangements and related collateral 1  
Instruments outside netting arrangements 1,147 1,700
Balance sheet total 19,389 19,036
Non trading repos    
Instruments which can be offset    
Gross 30,047 22,590
IFRS offset (7,594) (10,953)
Balance sheet 22,453 11,637
Potential for offset not recognised by IFRS    
Other financial collateral (22,453) (11,637)
Balance sheet total 22,453 11,637
Trading reverse repos    
Instruments which can be offset    
Gross 44,529 43,908
IFRS offset (24,422) (24,867)
Balance sheet 20,107 19,041
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (900) (929)
Other financial collateral (19,136) (18,040)
Net amount after the effect of netting arrangements and related collateral 71 72
Instruments outside netting arrangements   363
Balance sheet total   19,404
Potential for offset not recognised by IFRS    
Instruments outside netting arrangements 635  
Balance sheet total 20,742  
Derivatives [Member]    
Instruments which can be offset    
Gross 113,220 176,425
IFRS offset (7,961) (10,807)
Balance sheet 105,259 165,618
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (85,006) (137,086)
Cash collateral (15,035) (19,608)
Other financial collateral (2,428) (5,053)
Net amount after the effect of netting arrangements and related collateral 2,790 3,871
Instruments outside netting arrangements 880 905
Balance sheet total 106,139 166,523
Potential for offset not recognised by IFRS    
Financial Assets 106,139 166,523
Trading assets    
Potential for offset not recognised by IFRS    
Financial Assets 59,158 68,990
Non trading reverse repos    
Instruments which can be offset    
Gross 33,729 36,117
IFRS offset (7,594) (10,953)
Balance sheet 26,135 25,164
Potential for offset not recognised by IFRS    
Other financial collateral (26,135) (25,164)
Instruments outside netting arrangements 16  
Balance sheet total £ 26,151 £ 25,164