STRUCTURED ENTITIES (Details) - GBP (£) £ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
STRUCTURED ENTITIES (Details) [Line Items]
Loans and advances to banks	£ 6,611	£ 26,902	£ 25,117
Asset-backed debt instruments held	40,901	55,311
Assets and liabilities held in consolidated collective investment vehicles	68,124	75,669
Assets and liabilities held in unconsolidated collective investment vehicles	28,759	15,611
Total Asset Value Of Unconsolidated Structured Entities	2,338,000	1,849,000
Cancara [Member]
STRUCTURED ENTITIES (Details) [Line Items]
Financial assets pledged as collateral for liabilities or contingent liabilities	6,049	6,840
Loans and advances to banks	5,939	6,684
Asset-backed debt instruments held	£ 110	£ 156

The amount of debt instruments held that are backed by underlying assets. [Refer: Debt instruments held]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2016-01-13
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard
-URIDate 2016-03-31

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- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2016-01-13
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_14_a&doctype=Standard
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- Definition

The amount of loans and advances the entity has made to banks. [Refer: Advances received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2016-01-13
-Paragraph 55
-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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- References

No definition available.

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- Definition

Total Asset Value Of Unconsolidated Structured Entities

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No definition available.

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