Pensions and Other Post-Employment Benefit Plans - Schedule of Key Actuarial Assumptions Used to Determine Benefit Obligations (Detail)	Dec. 31, 2018	Dec. 31, 2017
Russia [member]
Disclosure of fair value of plan assets [line items]
Discount rate	8.60%	7.60%
Inflation rates	4.00%	4.40%
Rate of compensation increase	5.00%	5.40%
Germany [member]
Disclosure of fair value of plan assets [line items]
Discount rate	1.90%	1.80%
Rate of compensation increase	4.00%	4.00%
Ukraine [member]
Disclosure of fair value of plan assets [line items]
Discount rate	11.80%	10.10%
Inflation rates	6.60%	8.60%
Rate of compensation increase	9.60%	11.60%
Austria [member]
Disclosure of fair value of plan assets [line items]
Discount rate	1.70%	1.50%
Rate of compensation increase	2.25%	2.25%

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 2018-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard
-URIDate 2018-03-16

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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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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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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.

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