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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

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