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Employee Benefits - Summary of the Actuarial Results Generated for the Pension and Retirement Plans as well as the Medical Services (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year $ 107,944,581 $ 98,020,192 $ 106,638,436
Current service cost 3,322,813 4,285,693 4,606,856
Interest cost on projected benefit obligation 30,185,257 28,922,385 27,275,363
Expected return on plan assets (20,804,104) (20,916,104) (18,972,042)
Changes in the asset ceiling during the period and others 587,373 716,330 875,192
Past service costs and other 157,765 53,032 165,851
Actuarial gain for changes in experience (7,222) (35,145) (28,867)
Actuarial gain from changes in demographic assumptions 134,625 (85)  
Actuarial (gain) loss from changes in financial assumptions (24,890) (4,294) 7,784
Net period cost 13,551,617 13,021,812 13,930,137
Actuarial loss for changes in experience   11,671,860  
Actuarial gain for changes in experience (21,283,470)   (20,976,837)
Actuarial gain from changes in demographic assumptions   (381,172)  
Actuarial loss from changes in demographic assumptions 68,482   397,985
Actuarial loss from changes in financial assumptions     1,718,189
Actuarial gain (loss) from changes in financial assumptions (1,246,539) 2,438,078  
Changes in the asset ceiling during the period and others (1,055,409) (856,188) (754,535)
Return on plan assets greater than discount rate 23,503,296 (2,483,430) (4,724,041)
Recognized in other comprehensive income (13,640) 10,389,148 (24,339,239)
Contributions to the pension plan made by the Company (1,565,792) (2,697,621) (2,756,519)
Benefits paid     (176,702)
Payments to employees (10,651,938) (9,843,743) (525,612)
Effect of translation (1,145,960) (945,207) 5,249,691
Others (13,363,690) (13,486,571) 1,790,858
Balance at the end of the year 108,118,868 107,944,581 98,020,192
Less short-term portion (212,141) (172,406) (152,448)
Non-current obligation 107,906,727 107,772,175 97,867,744
Defined benefit obligation [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year 329,113,625 313,282,595 314,049,729
Current service cost 3,322,813 4,285,693 4,606,856
Interest cost on projected benefit obligation 30,185,257 28,922,385 27,275,363
Actuarial gain for changes in experience (7,222) (35,145) (28,867)
Actuarial gain from changes in demographic assumptions 134,625 (85)  
Actuarial (gain) loss from changes in financial assumptions (24,890) (4,294) 7,784
Net period cost 33,610,583 33,168,554 31,861,136
Actuarial loss for changes in experience   11,671,860  
Actuarial gain for changes in experience (21,283,470)   (20,976,837)
Actuarial gain from changes in demographic assumptions   (381,172)  
Actuarial loss from changes in demographic assumptions 68,482   397,985
Actuarial loss from changes in financial assumptions     1,718,189
Actuarial gain (loss) from changes in financial assumptions (1,246,539) 2,438,078  
Recognized in other comprehensive income (22,461,527) 13,728,766 (18,860,663)
Contributions made by plan participants 173,722 198,713 255,760
Benefits paid (19,546,541) (18,841,754) (25,694,301)
Payments to employees (10,651,938) (9,843,743) (525,612)
Effect of translation (3,535,477) (2,579,506) 12,196,546
Others (33,560,234) (31,066,290) (13,767,607)
Balance at the end of the year 306,702,447 329,113,625 313,282,595
Less short-term portion (212,141) (172,406) (152,448)
Non-current obligation 306,490,306 328,941,219 313,130,147
Plan assets [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year (227,688,604) (222,345,621) (212,234,440)
Expected return on plan assets (20,804,104) (20,916,104) (18,972,042)
Past service costs and other 157,765 53,032 165,851
Net period cost (20,646,339) (20,863,072) (18,806,191)
Return on plan assets greater than discount rate 23,503,296 (2,483,430) (4,724,041)
Recognized in other comprehensive income 23,503,296 (2,483,430) (4,724,041)
Contributions made by plan participants (173,722) (198,713) (255,760)
Contributions to the pension plan made by the Company (1,565,792) (2,697,621) (2,756,519)
Benefits paid 19,546,541 18,841,754 25,517,599
Effect of translation 3,353,498 2,058,099 (9,086,269)
Others 21,160,525 18,003,519 13,419,051
Balance at the end of the year (203,671,122) (227,688,604) (222,345,621)
Non-current obligation (203,671,122) (227,688,604) (222,345,621)
Effect of asset celling [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year 6,519,560 7,083,218 4,823,147
Changes in the asset ceiling during the period and others 587,373 716,330 875,192
Net period cost 587,373 716,330 875,192
Changes in the asset ceiling during the period and others (1,055,409) (856,188) (754,535)
Recognized in other comprehensive income (1,055,409) (856,188) (754,535)
Effect of translation (963,981) (423,800) 2,139,414
Others (963,981) (423,800) 2,139,414
Balance at the end of the year 5,087,543 6,519,560 7,083,218
Non-current obligation $ 5,087,543 $ 6,519,560 $ 7,083,218