CONTINGENT LIABILITIES AND COMMITMENTS (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2016
CONTINGENT LIABILITIES AND COMMITMENTS (Details) [Line Items]
Payments in respect of settlements, reimbursement rights		£ 217
Loans payable in default	£ 4,678		£ 15,655
Increase (Decrease) In Current Tax Liability	650
Increase (decrease) in deferred tax liability (asset)	(350)
Liabilities	762,966		769,328
Capital commitments	444		543
Recognised finance lease as assets	440		541
Irrevocable Loan Commitments [Member]
CONTINGENT LIABILITIES AND COMMITMENTS (Details) [Line Items]
Liabilities	£ 60,126		£ 63,203

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

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

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The amount of present obligations of the entity arising from past events, the settlement of which is expected to result in an outflow from the entity of resources embodying economic benefits.

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The amount of loans payable in default.

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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]]

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The amount of assets recognised by the entity, which are leased under finance leases.

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Increase (Decrease) In Current Tax Liability

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