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Pensions and Other Post-Employment Benefit Plans - Schedule of Changes in Present Value of Defined Benefit Obligations and Other Long-term Benefits and Fair Value of Plan Assets (Detail) - RUB (₽)
₽ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [abstract]      
Beginning balance ₽ (4,361) ₽ (4,445) ₽ (4,866)
Current service cost (130) (142) (149)
Net interest expense (279) (314) (368)
Curtailment / settlement gain 4 1 272
Remeasurement of pension obligations (492) 174 53
Past service cost 70   (5)
Sub-total included in profit or loss (827) (281) (197)
Benefit paid 282 296 341
Exchange difference (172) (76) 300
Actuarial changes arising from changes in demographic assumptions (38) 51 80
Actuarial changes arising from changes in financial assumptions 354 (69) (397)
Experience adjustments 171 163 294
Sub-total included in OCI 315 69 277
Ending balance (4,591) (4,361) (4,445)
Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [abstract]      
Beginning balance (4,632) (4,697) (5,184)
Current service cost (130) (142) (149)
Net interest expense (266) (331) (381)
Curtailment / settlement gain 4 1 272
Remeasurement of pension obligations (492) 174 53
Past service cost 70   (5)
Sub-total included in profit or loss (814) (298) (210)
Benefit paid 299 313 357
Exchange difference (213) (95) 363
Actuarial changes arising from changes in demographic assumptions (38) 51 80
Actuarial changes arising from changes in financial assumptions 354 (69) (397)
Experience adjustments 171 163 294
Sub-total included in OCI 274 50 340
Ending balance (4,873) (4,632) (4,697)
Plan assets [member]      
Disclosure of defined benefit plans [abstract]      
Beginning balance 271 252 318
Net interest expense (13) 17 13
Sub-total included in profit or loss (13) 17 13
Benefit paid (17) (17) (16)
Exchange difference 41 19 (63)
Sub-total included in OCI 41 19 (63)
Ending balance ₽ 282 ₽ 271 ₽ 252