NET TRADING INCOME - Schedule of Net Trading Income (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of trading income (expense) [Abstract]
Foreign exchange translation gains (losses)	£ 212	£ 12	£ (255)
Gains on foreign exchange trading transactions	394	527	677
Total foreign exchange	606	539	422
Investment property gains (losses) (note 25)	575	(209)	(108)
Securities and other gains	16,019	6,890	17,974
Net trading income	£ 17,200	£ 7,220	£ 18,288

The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax, before reclassification adjustments. [Refer: Other comprehensive income]

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The gains (losses) from changes in the fair value of investment property. [Refer: Investment property]

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The net gain arising from exchange differences recognised in profit or loss, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Foreign exchange gain (loss)]

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