Commitments, contingencies and operating risks - Pledge of assets and guarantees issued (Details) - RUB (₽) ₽ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Assets pledged and guarantees
Maximum term of guaranties issued to non-related parties	5 years
Financial and performance guaranties issued	₽ 1,260	₽ 74
Major partner
Assets pledged and guarantees
Pledged debt instruments as collateral for bank guarantee	1,445	1,319
CBR
Assets pledged and guarantees
Pledged debt instruments as collateral for bank guarantee	₽ 484	₽ 486

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_14_a&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant