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Financial instruments - Fair value measurement (Details) - RUB (₽)
₽ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments    
Transfer of assets out of Level 1 into Level 2 ₽ 0  
Transfer of assets out of Level 2 into Level 1 0  
Transfer of assets into Level 3 0  
Transfer of assets out of Level 3 0  
At fair value | Long-term loans    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 71  
At fair value | Long-term loans | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 71  
Fair value disclosed | Debt instruments    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 1,931 ₽ 1,827
Fair value disclosed | Debt instruments | Quoted prices in active markets (Level 1)    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 1,931 1,827
Fair value disclosed | Long-term loans    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 159 164
Fair value disclosed | Long-term loans | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments    
Financial assets, fair value ₽ 159 ₽ 164