FINANCIAL INSTRUMENTS (Details) - Schedule of Movements in Level 3 Portfolio - Level 3 of fair value hierarchy [member] - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Financial assets at fair value through profit or loss, category [member]
FINANCIAL INSTRUMENTS (Details) - Schedule of Movements in Level 3 Portfolio [Line Items]
Beginning Balance	£ 13,917	£ 14,152
Exchange and other adjustments	(85)	87
Gains recognised in the income statement within other income	794	439
Purchases/increases to customer loans	2,579	2,480
Sales	(2,807)	(3,593)
Transfers into the level 3 portfolio	644	815
Transfers out of the level 3 portfolio	(134)	(463)
Ending Balance	14,908	13,917
Gains (losses) recognised in the income statement, within other income, relating to the change in fair value of those assets held at 31 December	269	(104)
Financial assets at fair value through other comprehensive income, category [member]
FINANCIAL INSTRUMENTS (Details) - Schedule of Movements in Level 3 Portfolio [Line Items]
Beginning Balance	267	302
Exchange and other adjustments	(10)	(2)
(Losses) gains recognised in other comprehensive income within the revaluation reserve in respect of financial assets at fair value through other comprehensive income	12	(4)
Purchases/increases to customer loans	207	2
Sales	(87)	(95)
Transfers into the level 3 portfolio	19	348
Transfers out of the level 3 portfolio		(284)
Ending Balance	408	267
Financial Assets, Excluding Derivatives [Member]
FINANCIAL INSTRUMENTS (Details) - Schedule of Movements in Level 3 Portfolio [Line Items]
Beginning Balance	14,184	14,454
Exchange and other adjustments	(95)	85
Gains recognised in the income statement within other income	794	439
(Losses) gains recognised in other comprehensive income within the revaluation reserve in respect of financial assets at fair value through other comprehensive income	12	(4)
Purchases/increases to customer loans	2,786	2,482
Sales	(2,894)	(3,688)
Transfers into the level 3 portfolio	663	1,163
Transfers out of the level 3 portfolio	(134)	(747)
Ending Balance	15,316	14,184
Gains (losses) recognised in the income statement, within other income, relating to the change in fair value of those assets held at 31 December	£ 269	£ (104)

The fair value gains (losses) recognised in other comprehensive income on financial assets reclassified out of the available-for-sale category. [Refer: Financial assets available-for-sale; Other comprehensive income]

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

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The increase (decrease) in financial assets resulting from foreign exchange and other movements. [Refer: Financial assets]

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The amount of other comprehensive income, net of tax, related to gains (losses) in relation to changes in the revaluation surplus. [Refer: Other comprehensive income; Revaluation surplus]

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The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]

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The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]]

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