Analysis of the net investment in business interest and intangible assets, proceeds on disposal (Details) £ in Millions	12 Months Ended
Dec. 31, 2015 GBP (£)
Citizens
Noncurrent assets or disposal groups classified as held for sale
Cash proceeds relating to disposal of controlling interest	£ 1,628

The aggregate cash flows arising from losing control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 39
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_39&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration