Pensions and Other Post-Employment Benefit Plans - Schedule of Plan Asset Allocation of Investment Portfolio (Detail) - RUB (₽) ₽ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value of plan assets [abstract]
Debt instruments	₽ 161	₽ 147
Equity instruments	74	78
Cash and cash equivalents	19	25
Property	15	11
Other assets	13	10
Total plan assets	₽ 282	₽ 271

The amount that cash and cash equivalents constitute of the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

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The amount that instruments representing debt (rather than equity) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount that instruments representing equity (rather than debt) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount that other types of assets not separately disclosed constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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The amount that real estate constitutes of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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