OTHER RESERVES (Details) - Schedule of Other Reserves - GBP (£) £ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Other Reserves [Abstract]
Merger reserve	£ 7,766	£ 7,766	£ 7,976
Capital redemption reserve	4,115	4,115	4,115
Revaluation reserve in respect of available-for-sale financial assets	685	759	(438)
Cash flow hedging reserve	1,405	2,136	727
Foreign currency translation reserve	(156)	(124)	(120)
At 31 December	£ 13,815	£ 14,652	£ 12,260

A component of equity representing the reserve for the redemption of the entity's own shares.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard
-URIDate 2016-03-31

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- Definition

A component of equity that may result in relation to a business combination outside the scope of IFRS 3.

+ References

+ Details

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Namespace Prefix:	ifrs-full_
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- Definition

A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
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- Definition

A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 9
-IssueDate 2016-01-13
-Paragraph 6.5.11
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2016-03-30&anchor=para_6.5.11&doctype=Standard
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- Definition

A component of equity representing exchange differences on translation of financial statements of foreign operations recognised in other comprehensive income and accumulated in equity. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 21
-IssueDate 2016-01-13
-Paragraph 52
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2016-03-30&anchor=para_52_b&doctype=Standard
-URIDate 2016-03-31

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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 2018-01-01
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- References

No definition available.

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