Post-retirement defined benefit schemes - Principal Assumptions (Details)	Jun. 30, 2018	Dec. 31, 2017
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Principal Actuarial and Financial Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items]
Discount rate	2.78%	2.59%
Rate of inflation:
Rate of salary increases	0.00%	0.00%
Weighted-average rate of increase for pensions in payment	2.67%	2.73%
Retail Prices Index
Rate of inflation:
Price Index	3.11%	3.20%
Consumer Price Index
Rate of inflation:
Price Index	2.06%	2.15%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2016-01-13
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard
-URIDate 2016-03-31

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- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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- Definition

The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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