INCOME TAX - Valuation Allowance (Details) ₽ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2019 RUB (₽)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 RUB (₽)	Dec. 31, 2017 RUB (₽)
Movements in the valuation allowance
Balance at the beginning of the period	₽ (1,730)	$ (21.9)	₽ (922)	₽ (659)
Charged to expenses	(2,285)	(29.0)	(850)	(332)
Foreign currency translation adjustment	205	2.6	42	69
Balance at the end of the period	₽ (3,810)	$ (48.3)	₽ (1,730)	₽ (922)

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that arising from foreign currency translation adjustments.

+ References

No definition available.

+ Details

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