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Tax - Tax losses (Details) - GBP (£) £ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Unused tax losses |  |
Deferred tax asset | £ 1,195 | £ 901
Total losses carried forward |  |
Unused tax losses |  |
Deferred tax asset | 899 | 905
Total losses carried forward | National Westminster Bank Plc |  |
Unused tax losses |  |
Deferred tax asset |  | 592
Total losses carried forward | UK |  |
Unused tax losses |  |
Deferred tax asset | 840 | 862
Total losses carried forward | UK | NatWest Markets Plc |  |
Unused tax losses |  |
Deferred tax asset | 56 | 62
Total losses carried forward | UK | National Westminster Bank Plc |  |
Unused tax losses |  |
Deferred tax asset | 608 | 592
Total losses carried forward | UK | RBS plc |  |
Unused tax losses |  |
Deferred tax asset | 176 | 200
Total losses carried forward | UK | Ulster Bank |  |
Unused tax losses |  |
Deferred tax asset |  | 8
Total losses carried forward | Ireland | UBIDAC |  |
Unused tax losses |  |
Deferred tax asset | 11 | £ 43
Total losses carried forward | Ireland | NWM N.V. |  |
Unused tax losses |  |
Deferred tax asset | £ 48 |

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