LIABILITIES ARISING FROM INSURANCE CONTRACTS AND PARTICIPATING INVESTMENT CONTRACTS (Details) - Schedule of Provisions for Unearned Premiums - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Provisions for unearned premiums
Gross provision at 1 January	£ 404	£ 461
Change in provisions	(2,165)	(2,374)	£ (4,837)
Change in provision for unearned premiums charged to income statement	(46)	(57)
Gross provision at 31 December	358	404	£ 461
Reinsurers’ share	(13)	(14)
Net provision at 31 December	345	390
Increase [Member]
Provisions for unearned premiums
Change in provisions	724	827
Release [Member]
Provisions for unearned premiums
Change in provisions	£ (770)	£ (884)

The amount of assets under reinsurance contracts in which the entity is the policyholder.

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- Definition

The increase (decrease) in other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of current provisions. [Refer: Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The increase (decrease) in the provision for unearned premiums. [Refer: Unearned premiums]

+ References

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

The amount of liabilities of uncertain timing or the amount recognised when: (a) the entity has a present obligation (legal or constructive) as a result of a past event; (b) it is probable (ie more likely than not) that an outflow of resources embodying economic benefits will be required to settle the obligation; and (c) a reliable estimate can be made of the amount of the obligation.

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