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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year $ 108,118,868 $ 107,944,581 $ 98,020,192
Current service cost 2,591,975 3,322,813 4,285,693
Interest cost on projected benefit obligation 31,001,348 30,185,257 28,922,385
Expected return on plan assets (20,070,037) (20,804,104) (20,916,104)
Changes in the asset ceiling during the period and others 445,743 587,373 716,330
Past service costs and other 144,481 157,765 53,032
Actuarial gain for changes in experience (22,599) (7,222) (35,145)
Actuarial gain from changes in demographic assumptions (339,657) 134,625 (85)
Actuarial (gain) loss from changes in financial assumptions 36,163 (24,890) (4,294)
Net period cost 14,126,945 13,551,617 13,021,812
Actuarial loss for changes in experience     11,671,860
Actuarial gain for changes in experience (129) (21,283,470)  
Actuarial gain from changes in demographic assumptions     (381,172)
Actuarial loss from changes in demographic assumptions 31,606,323 68,482  
Actuarial loss from changes in financial assumptions 7,207,072    
Actuarial gain (loss) from changes in financial assumptions   (1,246,539) 2,438,078
Changes in the asset ceiling during the period and others (712,064) (1,055,409) (856,188)
Return on plan assets greater than discount rate 423,514 23,503,296 (2,483,430)
Recognized in other comprehensive income 38,185,188 (13,640) 10,389,148
Contributions to the pension plan made by the Company (1,337,610) (1,565,792) (2,697,621)
Payments to employees (16,996,920) (10,651,938) (9,843,743)
Effect of translation (1,399,497) (1,145,960) (945,207)
Others (19,734,027) (13,363,690) (13,486,571)
Balance at the end of the year 140,696,974 108,118,868 107,944,581
Less short-term portion (213,065) (212,141) (172,406)
Non-current obligation 140,483,909 107,906,727 107,772,175
Defined benefit obligation [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year 306,702,447 329,113,625 313,282,595
Current service cost 2,591,975 3,322,813 4,285,693
Interest cost on projected benefit obligation 31,001,348 30,185,257 28,922,385
Actuarial gain for changes in experience (22,599) (7,222) (35,145)
Actuarial gain from changes in demographic assumptions (339,657) 134,625 (85)
Actuarial (gain) loss from changes in financial assumptions 36,163 (24,890) (4,294)
Net period cost 33,606,758 33,610,583 33,168,554
Actuarial loss for changes in experience     11,671,860
Actuarial gain for changes in experience (129) (21,283,470)  
Actuarial gain from changes in demographic assumptions     (381,172)
Actuarial loss from changes in demographic assumptions 31,606,323 68,482  
Actuarial loss from changes in financial assumptions 7,207,072    
Actuarial gain (loss) from changes in financial assumptions   (1,246,539) 2,438,078
Recognized in other comprehensive income 38,473,738 (22,461,527) 13,728,766
Contributions made by plan participants 155,188 173,722 198,713
Benefits paid (15,836,928) (19,546,541) (18,841,754)
Payments to employees (16,996,920) (10,651,938) (9,843,743)
Effect of translation (3,534,509) (3,535,477) (2,579,506)
Others (36,213,169) (33,560,234) (31,066,290)
Balance at the end of the year 342,569,774 306,702,447 329,113,625
Less short-term portion (213,065) (212,141) (172,406)
Non-current obligation 342,356,709 306,490,306 328,941,219
Plan assets [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year (203,671,122) (227,688,604) (222,345,621)
Expected return on plan assets (20,070,037) (20,804,104) (20,916,104)
Past service costs and other 144,481 157,765 53,032
Net period cost (19,925,556) (20,646,339) (20,863,072)
Return on plan assets greater than discount rate 423,514 23,503,296 (2,483,430)
Recognized in other comprehensive income 423,514 23,503,296 (2,483,430)
Contributions made by plan participants (155,188) (173,722) (198,713)
Contributions to the pension plan made by the Company (1,337,610) (1,565,792) (2,697,621)
Benefits paid 15,836,928 19,546,541 18,841,754
Effect of translation 2,528,213 3,353,498 2,058,099
Others 16,872,343 21,160,525 18,003,519
Balance at the end of the year (206,300,821) (203,671,122) (227,688,604)
Non-current obligation (206,300,821) (203,671,122) (227,688,604)
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 5,087,543 6,519,560 7,083,218
Changes in the asset ceiling during the period and others 445,743 587,373 716,330
Net period cost 445,743 587,373 716,330
Changes in the asset ceiling during the period and others (712,064) (1,055,409) (856,188)
Recognized in other comprehensive income (712,064) (1,055,409) (856,188)
Effect of translation (393,201) (963,981) (423,800)
Others (393,201) (963,981) (423,800)
Balance at the end of the year 4,428,021 5,087,543 6,519,560
Non-current obligation $ 4,428,021 $ 5,087,543 $ 6,519,560