STRUCTURED ENTITIES (Details) - GBP (£) £ in Millions	Dec. 31, 2019	Dec. 31, 2018
STRUCTURED ENTITIES (Details) [Line Items]
Loans and advances to customers	£ 494,988	£ 484,858
Asset-backed debt instruments held	24,330	24,491
Assets and liabilities held in consolidated collective investment vehicles	68,724	62,648
Assets and liabilities held in unconsolidated collective investment vehicles	38,177	26,028
Total Asset Value Of Unconsolidated Structured Entities	2,363,000	2,435,000
Cancara [Member]
STRUCTURED ENTITIES (Details) [Line Items]
Financial assets pledged as collateral for liabilities or contingent liabilities	3,735	5,122
Loans and advances to customers	3,670	5,012
Asset-backed debt instruments held	£ 65	£ 110

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

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- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

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

The amount of loans and advances the entity has made to customers.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Total Asset Value Of Unconsolidated Structured Entities

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