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Condensed consolidating financial information (Details) - GBP (£)
£ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2017
CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Details) [Line Items]        
Increase (decrease) through change in equity of subsidiaries, equity £ (786) £ 1,051 £ 357  
Company        
CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Details) [Line Items]        
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity 4,069     £ 5,682
Lloyds Bank        
CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Details) [Line Items]        
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent (10,821)     £ (9,962)
Equity attributable to owners of parent [member]        
CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Details) [Line Items]        
Increase (decrease) through change in equity of subsidiaries, equity £ (254) £ (482) £ (658)