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CONTINGENT LIABILITIES AND COMMITMENTS (Details) - Schedule of Commitments - GBP (£)
£ in Millions
Dec. 31, 2017
Dec. 31, 2016
Commitments    
Forward asset purchases and forward deposits placed £ 384 £ 648
Total commitments 129,809 114,168
129,809 114,168
Not later than one year [member]    
Commitments    
93,039 73,446
Later than one year [member]    
Commitments    
1 year or over original maturity 36,386 40,074
Mortgages [member] | Not later than one year [member]    
Commitments    
11,156 10,749
Other [Member] | Not later than one year [member]    
Commitments    
£ 81,883 £ 62,697