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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Recorded in operating costs and expenses      
Service cost $ 228 $ 254 $ 176
Past service cost 168 (55) 8
Total defined benefit expense 396 199 184
Recorded in other financial expenses      
Net interest cost 775 767 768
Recorded in other comprehensive income      
Actuarial (gains) losses for the period (3,404) (3) 4,019
Total (loss) / gain recognized during the period (2,233) 963 4,971
Pension defined benefit plans [member]      
Recorded in operating costs and expenses      
Service cost 193 221 151
Past service cost 168 (55) 8
Total defined benefit expense 361 166 159
Recorded in other financial expenses      
Net interest cost 691 693 711
Recorded in other comprehensive income      
Actuarial (gains) losses for the period (3,415) 20 3,985
Total (loss) / gain recognized during the period (2,363) 879 4,855
Other Benefits Plans [Member]      
Recorded in operating costs and expenses      
Service cost 35 33 25
Past service cost 0 0 0
Total defined benefit expense 35 33 25
Recorded in other financial expenses      
Net interest cost 84 74 57
Recorded in other comprehensive income      
Actuarial (gains) losses for the period 11 (23) 34
Total (loss) / gain recognized during the period $ 130 $ 84 $ 116