OTHER INTANGIBLE ASSETS (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of intangible assets [text block] [Abstract]
Brand names	£ 380	£ 380
Purchased credit card relationships	£ 702

The amount of intangible assets representing rights to a group of complementary assets such as a trademark (or service mark) and its related trade name, formulas, recipes and technological expertise. [Refer: Intangible assets other than goodwill]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 38
-IssueDate 2016-01-13
-Paragraph 119
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_119_a&doctype=Standard
-URIDate 2016-03-31

Name:	ifrs-full_BrandNames
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant