DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue - Before IFRS 9 impairment adjustments [member] - GBP (£) £ in Millions	Dec. 31, 2019	Dec. 31, 2018
DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue [Line Items]
Medium-term notes issued	£ 41,291	£ 37,490
Covered bonds (note 31)	29,821	28,194
Certificates of deposit issued	10,598	12,020
Securitisation notes (note 31)	7,288	5,426
Commercial paper	8,691	8,038
Total debt securities in issue	£ 97,689	£ 91,168

The amount of bonds issued by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 112
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- Definition

The amount of commercial paper issued by the entity.

+ References

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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 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

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- Definition

The amount of notes and debentures issued by the entity.

+ References

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- References

No definition available.

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- References

No definition available.

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