DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue - Before IFRS 9 impairment adjustments [member] - GBP (£) £ in Millions	Dec. 31, 2018	Dec. 31, 2017
DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue [Line Items]
Medium-term notes issued	£ 37,490	£ 29,418
Covered bonds (note 30)	28,194	26,132
Certificates of deposit issued	12,020	9,999
Securitisation notes (note 30)	5,426	3,660
Commercial paper	8,038	3,241
Total debt securities in issue	£ 91,168	£ 72,450

The amount of bonds issued by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

The amount of commercial paper issued by the entity.

+ References

+ Details

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- Definition

The amount of instruments issued by the entity that represent indebtedness.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

The amount of notes and debentures issued by the entity.

+ References

+ Details

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- References

No definition available.

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- References

No definition available.

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No definition available.

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- Details

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