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TAXATION (Details) - Schedule of Income Tax Charges - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Income Tax Charges [Abstract]      
Tax (expense) credit attributable to policyholders £ (82) £ (301) £ 3
Shareholder tax expense (1,646) (1,423) (691)
Tax expense £ (1,728) £ (1,724) £ (688)