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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Actuarial Assumptions (Details) - Post-employment health care benefit cost	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	8.75%	7.25%	8.50%
Health care costs trend rate assumed for next year	7.00%	7.00%	7.00%
Ultimate health care costs trend rate	7.00%	7.00%	7.00%

X

- Definition

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]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2018-01-01
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The ultimate health care costs trend rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

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