AVAILABLE-FOR-SALE FINANCIAL ASSETS (Details) - Schedule of Available-For-Sale Financial Assets - Financial assets available-for-sale, category [member] £ in Millions	Dec. 31, 2017 GBP (£)
Debt securities:
Government securities	£ 34,708
Bank and building society certificates of deposit	167
Asset-backed securities:
Mortgage-backed securities	1,156
Other asset-backed securities	255
Corporate and other debt securities	4,615
	40,901
Equity shares	1,197
Total available-for-sale financial assets	£ 42,098

The amount of debt instruments held that are backed by underlying assets. [Refer: Debt instruments held]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of debt instruments held by the entity that were issued by a bank. [Refer: Debt instruments held]

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- Definition

The amount of debt instruments held by the entity that were issued by a corporate entity. [Refer: Debt instruments held]

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The amount of instruments held by the entity that provide evidence of a residual interest in the assets of another entity after deducting all of its liabilities.

+ References

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

The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of debt instruments held by the entity that were issued by a government. [Refer: Debt instruments held; Government [member]]

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The amount of debt instruments held by the entity that it does not separately disclose in the same statement or note. [Refer: Debt instruments held]

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