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Pensions and Post-Employment Benefits - Schedule Actuarial Results Related to Pension and Other Post Retirement Benefits (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Recorded in operating costs and expenses      
Service cost $ 254 $ 176 $ 158
Past service cost (55) 8 (8)
Loss for settlements and curtailments 0 0 (13)
Total defined benefit expense 199 184 137
Recorded in other financial expenses      
Net interest cost 767 768 652
Recorded in other comprehensive income      
Actuarial (gains) losses for the period (3) 4,019 748
Total (loss) / gain recognized during the period 963 4,971 1,537
Pensions [Member]      
Recorded in operating costs and expenses      
Service cost 221 151 128
Past service cost (55) 8 12
Loss for settlements and curtailments 0 0 0
Total defined benefit expense 166 159 140
Recorded in other financial expenses      
Net interest cost 693 711 596
Recorded in other comprehensive income      
Actuarial (gains) losses for the period 20 3,985 872
Total (loss) / gain recognized during the period 879 4,855 1,608
Other Benefits Plans [Member]      
Recorded in operating costs and expenses      
Service cost 33 25 30
Past service cost 0 0 (20)
Loss for settlements and curtailments 0 0 (13)
Total defined benefit expense 33 25 (3)
Recorded in other financial expenses      
Net interest cost 74 57 56
Recorded in other comprehensive income      
Actuarial (gains) losses for the period (23) 34 (124)
Total (loss) / gain recognized during the period $ 84 $ 116 $ (71)