CONTINGENT LIABILITIES AND COMMITMENTS (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
CONTINGENT LIABILITIES AND COMMITMENTS (Details) [Line Items]
Payments in respect of settlements, reimbursement rights			£ 217
Gross loan commitments	£ 135,098	£ 135,629
Capital commitments	378	444
Amounts Related To Assets To Be Leased Under Operating Leases Signage	369	440
Legal proceedings contingent liability [member]
CONTINGENT LIABILITIES AND COMMITMENTS (Details) [Line Items]
Increase (Decrease) In Current Tax Liability	770
Increase (decrease) in deferred tax liability (asset)	(250)
Irrevocable Loan Commitments [Member]
CONTINGENT LIABILITIES AND COMMITMENTS (Details) [Line Items]
Gross loan commitments	£ 64,884	£ 65,946

The amount of future capital expenditures that the entity is committed to make.

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

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- Definition

The amount of contractual undiscounted cash flows for gross commitments to receive a loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph B11D
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- Definition

The increase (decrease) in a deferred tax liability (asset). [Refer: Deferred tax liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
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- Definition

The decrease (increase) in reimbursement rights resulting from payments in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2018-01-01
-Paragraph 141
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&doctype=Standard
-URIDate 2018-03-16

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- References

No definition available.

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- Definition

Increase (Decrease) In Current Tax Liability

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No definition available.

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