ADOPTION OF IFRS 9 AND IFRS 15 (Details) - Schedule of Reclassifications £ in Millions	Dec. 31, 2018 GBP (£)
IAS 39 carrying amount [member]
ADOPTION OF IFRS 9 AND IFRS 15 (Details) - Schedule of Reclassifications [Line Items]
Financial assets at fair value through profit or loss	£ 162,878
Derivative financial instruments	25,834
Loans and advances to banks	6,611
Loans and advances to customers	472,498
Debt securities	3,643
Financial assets at amortised cost	482,752
Available-for-sale financial assets	42,098
Other assets	13,537
Total	727,099
Financial liabilities at fair value through profit or loss	50,877
Debt securities in issue	72,450
Total	123,327
IFRS 9 Reclassification at fair value through profit or loss [member]
ADOPTION OF IFRS 9 AND IFRS 15 (Details) - Schedule of Reclassifications [Line Items]
Financial assets at fair value through profit or loss	14,447
Derivative financial instruments	(360)
Loans and advances to banks	(2,274)
Loans and advances to customers	(10,474)
Financial assets at amortised cost	(12,748)
Available-for-sale financial assets	(684)
Other assets	(655)
Financial liabilities at fair value through profit or loss	48
Debt securities in issue	(48)
IFRS 9 Reclassification at fair value through other comprehensive income [member]
ADOPTION OF IFRS 9 AND IFRS 15 (Details) - Schedule of Reclassifications [Line Items]
Financial assets at fair value through profit or loss	(1,139)
Loans and advances to banks	(90)
Debt securities	(329)
Financial assets at amortised cost	(419)
Financial assets at fair value through other comprehensive income	42,972
Available-for-sale financial assets	(41,414)
Total reclassification [member]
ADOPTION OF IFRS 9 AND IFRS 15 (Details) - Schedule of Reclassifications [Line Items]
Financial assets at fair value through profit or loss	13,308
Derivative financial instruments	(360)
Loans and advances to banks	(2,364)
Loans and advances to customers	(10,474)
Debt securities	(329)
Financial assets at amortised cost	(13,167)
Financial assets at fair value through other comprehensive income	42,972
Available-for-sale financial assets	(42,098)
Other assets	(655)
Financial liabilities at fair value through profit or loss	48
Debt securities in issue	(48)
IFRS 9 remeasurement [member]
ADOPTION OF IFRS 9 AND IFRS 15 (Details) - Schedule of Reclassifications [Line Items]
Financial assets at fair value through profit or loss	(178)
Loans and advances to customers	14
Financial assets at amortised cost	14
Financial assets at fair value through other comprehensive income	(55)
Total	(219)
Financial liabilities at fair value through profit or loss	10
Total	10
Before IFRS 9 impairment adjustments [member]
ADOPTION OF IFRS 9 AND IFRS 15 (Details) - Schedule of Reclassifications [Line Items]
Financial assets at fair value through profit or loss	176,008
Derivative financial instruments	25,474
Loans and advances to banks	4,247
Loans and advances to customers	462,038
Debt securities	3,314
Financial assets at amortised cost	469,599
Financial assets at fair value through other comprehensive income	42,917
Other assets	12,882
Total	726,880
Financial liabilities at fair value through profit or loss	50,935
Debt securities in issue	72,402
Total	£ 123,337

The amount of instruments representing indebtedness held by the entity.

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The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) 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 deliver 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, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are 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. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities]

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