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Financial instruments - Fair value measurement (Details) - RUB (₽)
₽ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
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  
Debt instruments | FVOCI    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 1,082 ₽ 1,294
Long-term loans | FVPL    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 15 16
At fair value | Debt instruments | FVOCI    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 1,082 1,294
At fair value | Debt instruments | FVOCI | Quoted prices in active markets (Level 1)    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 1,082 1,294
At fair value | Long-term loans | FVPL    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 15 16
At fair value | Long-term loans | FVPL | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 15 16
Fair value disclosed | Debt instruments    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 5,360 3,913
Fair value disclosed | Debt instruments | Quoted prices in active markets (Level 1)    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 5,360 3,913
Fair value disclosed | Long-term loans    
Disclosure of detailed information about financial instruments    
Financial assets, fair value 249 249
Fair value disclosed | Long-term loans | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments    
Financial assets, fair value ₽ 249 ₽ 249