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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year $ 98,020,192 $ 106,638,436 $ 73,536,544
Current service cost 4,285,693 4,606,856 4,540,925
Interest cost on projected benefit obligation 28,922,385 27,275,363 25,811,047
Expected return on plan assets (20,916,104) (18,972,042) (20,710,965)
Changes in the asset ceiling during the period and others 716,330 875,192 601,540
Past service costs and other 53,032 165,851 (1,246,371)
Actuarial gain for changes in experience (35,145) (28,867) (27,949)
Actuarial gain from changes in demographic assumptions (85)    
Actuarial (gain) loss from changes in financial assumptions (4,294) 7,784 30,285
Net period cost 13,021,812 13,930,137 8,998,512
Actuarial loss for changes in experience 11,671,860    
Actuarial gain for changes in experience   (20,976,837) (2,021,790)
Actuarial gain (loss) from changes in financial assumptions (381,172) 397,985 (685,110)
Actuarial gain (loss) from changes in financial assumptions 2,438,078 1,718,189  
Actuarial gain from changes in financial assumptions     (2,502,344)
Changes in the asset ceiling during the period and others (856,188) (754,535) (754,357)
Return on plan assets greater than discount rate (2,483,430) (4,724,041) 31,026,539
Recognized in other comprehensive income 10,389,148 (24,339,239) 25,062,938
Contributions made by plan participants     231,619
Contributions to the pension plan made by the company (2,697,621) (2,756,519) (2,954,839)
Benefits paid   (176,702) (172,424)
Payments to employees (9,843,743) (525,612) (19,929)
Effect of translation (945,207) 5,249,691 1,956,015
Others (13,486,571) 1,790,858 (959,558)
Balance at the end of the year 107,944,581 98,020,192 106,638,436
Less short-term portion (172,406) (152,448) (118,411)
Non-current obligation 107,772,175 97,867,744 106,520,025
Defined benefit obligation [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year 313,282,595 314,049,729 309,639,799
Current service cost 4,285,693 4,606,856 4,540,925
Interest cost on projected benefit obligation 28,922,385 27,275,363 25,811,047
Past service costs and other     (1,365,096)
Actuarial gain for changes in experience (35,145) (28,867) (27,949)
Actuarial gain from changes in demographic assumptions (85)    
Actuarial (gain) loss from changes in financial assumptions (4,294) 7,784 30,285
Net period cost 33,168,554 31,861,136 28,989,212
Actuarial loss for changes in experience 11,671,860    
Actuarial gain for changes in experience   (20,976,837) (2,021,790)
Actuarial gain (loss) from changes in financial assumptions (381,172) 397,985 (685,110)
Actuarial gain (loss) from changes in financial assumptions 2,438,078 1,718,189  
Actuarial gain from changes in financial assumptions     (2,502,344)
Recognized in other comprehensive income 13,728,766 (18,860,663) (5,209,244)
Contributions made by plan participants 198,713 255,760 231,619
Benefits paid (18,841,754) (25,694,301) (22,321,686)
Payments to employees (9,843,743) (525,612) (19,929)
Effect of translation (2,579,506) 12,196,546 2,739,958
Others (31,066,290) (13,767,607) (19,370,038)
Balance at the end of the year 329,113,625 313,282,595 314,049,729
Less short-term portion (172,406) (152,448) (118,411)
Non-current obligation 328,941,219 313,130,147 313,931,318
Plan assets [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year (222,345,621) (212,234,440) (242,360,329)
Expected return on plan assets (20,916,104) (18,972,042) (20,710,965)
Past service costs and other 53,032 165,851 118,725
Net period cost (20,863,072) (18,806,191) (20,592,240)
Return on plan assets greater than discount rate (2,483,430) (4,724,041) 31,026,539
Recognized in other comprehensive income (2,483,430) (4,724,041) 31,026,539
Contributions made by plan participants (198,713) (255,760)  
Contributions to the pension plan made by the company (2,697,621) (2,756,519) (2,954,839)
Benefits paid 18,841,754 25,517,599 22,149,262
Effect of translation 2,058,099 (9,086,269) 497,167
Others 18,003,519 13,419,051 19,691,590
Balance at the end of the year (227,688,604) (222,345,621) (212,234,440)
Non-current obligation (227,688,604) (222,345,621) (212,234,440)
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 7,083,218 4,823,147 6,257,074
Changes in the asset ceiling during the period and others 716,330 875,192 601,540
Net period cost 716,330 875,192 601,540
Changes in the asset ceiling during the period and others (856,188) (754,535) (754,357)
Recognized in other comprehensive income (856,188) (754,535) (754,357)
Effect of translation (423,800) 2,139,414 (1,281,110)
Others (423,800) 2,139,414 (1,281,110)
Balance at the end of the year 6,519,560 7,083,218 4,823,147
Non-current obligation $ 6,519,560 $ 7,083,218 $ 4,823,147