CONTINGENT LIABILITIES, COMMITMENTS, AND GUARANTEES (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
CONTINGENT LIABILITIES, COMMITMENTS, AND GUARANTEES (Details) [Line Items]
Payments in respect of settlements, reimbursement rights			£ 217
Gross loan commitments	£ 133,553	£ 135,098
Capital commitments	405	378
Amounts Related To Assets To Be Leased Under Operating Leases Signage	400	369
Irrevocable Loan Commitments [Member]
CONTINGENT LIABILITIES, COMMITMENTS, AND GUARANTEES (Details) [Line Items]
Gross loan commitments	63,504	£ 64,884
Legal proceedings contingent liability [member]
CONTINGENT LIABILITIES, COMMITMENTS, AND GUARANTEES (Details) [Line Items]
Increase (Decrease) In Current Tax Liability	800
Increase (decrease) in deferred tax liability (asset)	£ (250)

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2019-01-01
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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
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-IssueDate 2019-01-01
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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 2019-01-01
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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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Increase (Decrease) In Current Tax Liability

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