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FINANCIAL ASSETS AT FAIR VALUE THROUGH PROFIT OR LOSS - Narrative (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
FINANCIAL ASSETS AT FAIR VALUE THROUGH PROFIT OR LOSS (Details) - Narrative [Line Items]    
Financial assets at fair value through profit or loss [1] £ 206,771 £ 191,169
Assets and liabilities held in unconsolidated collective investment vehicles 74,916 55,235
Types of insurance contracts    
FINANCIAL ASSETS AT FAIR VALUE THROUGH PROFIT OR LOSS (Details) - Narrative [Line Items]    
Financial assets at fair value through profit or loss £ 179,988 £ 165,448
[1] See note 1 regarding changes to presentation.