OTHER RESERVES (Details) - Schedule of Movement in Other Reserves - Reserve of gains and losses on remeasuring available-for-sale financial assets [member] £ in Millions	12 Months Ended
Dec. 31, 2017 GBP (£)
Revaluation reserve in respect of available-for-sale financial assets
Beginning Balance	£ 759
Ending Balance	685
Income statement transfers [Member]
Revaluation reserve in respect of available-for-sale financial assets
Disposals	(353)
Financial assets available-for-sale, category [member]
Revaluation reserve in respect of available-for-sale financial assets
Change in fair value of available-for-sale financial assets	273
Other [Member] \| Income statement transfers [Member]
Revaluation reserve in respect of available-for-sale financial assets
Impairment	6
Pre-Tax [Member] \| Income statement transfers [Member]
Revaluation reserve in respect of available-for-sale financial assets
Disposals	(446)
Pre-Tax [Member] \| Financial assets available-for-sale, category [member]
Revaluation reserve in respect of available-for-sale financial assets
Change in fair value of available-for-sale financial assets	303
Pre-Tax [Member] \| Other [Member] \| Income statement transfers [Member]
Revaluation reserve in respect of available-for-sale financial assets
Impairment	6
Deferred Income Tax Charge [Member]
Revaluation reserve in respect of available-for-sale financial assets
Change in fair value of available-for-sale financial assets	(26)
Deferred Income Tax Charge [Member] \| Income statement transfers [Member]
Revaluation reserve in respect of available-for-sale financial assets
Disposals	93
Current Tax [Member]
Revaluation reserve in respect of available-for-sale financial assets
Change in fair value of available-for-sale financial assets	£ (4)

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]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 12A
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_12A_d&doctype=Standard&book=b
-URIDate 2019-03-27

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- Definition

The gain on disposals of non-current assets. [Refer: Non-current assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
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- Definition

The amount of impairment loss recognised in other comprehensive income. Impairment loss on a revalued asset is recognised in other comprehensive income to the extent that the impairment loss does not exceed the amount in the revaluation surplus for that same asset. [Refer: Impairment loss; Revaluation surplus; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2019-01-01
-Paragraph 126
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_126_c&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2019-01-01
-Paragraph 129
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_129_a&doctype=Standard
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- Definition

A component of equity representing accumulated gains and losses on remeasuring available-for-sale financial assets. [Refer: Financial assets available-for-sale]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2021-01-01
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 78
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-URIDate 2019-03-27

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- References

No definition available.

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