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CONTINGENT LIABILITIES, COMMITMENTS, AND GUARANTEES (Details) - Schedule of Commitments - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Commitments and guarantees    
Commitments £ 133,553 £ 135,098
Documentary credits and other short-term trade-related transactions [member]    
Commitments and guarantees    
Commitments   1
Forward asset purchases and forward deposits placed [member]    
Commitments and guarantees    
Commitments 189 731
Not later than one year [member]    
Commitments and guarantees    
Commitments 98,419 96,654
Not later than one year [member] | Mortgages [member]    
Commitments and guarantees    
Commitments 12,684 11,594
Not later than one year [member] | Other [Member]    
Commitments and guarantees    
Commitments 85,735 85,060
Later than one year [member]    
Commitments and guarantees    
Commitments £ 34,945 £ 37,712