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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year $ 140,696,974 $ 108,118,868 $ 107,944,581
Current service cost 2,810,584 2,591,975 3,322,813
Interest cost on projected benefit obligation 30,482,173 31,001,348 30,185,257
Expected return on plan assets 17,655,119 (20,070,037) (20,804,104)
Changes in the asset ceiling during the period and others 278,639 445,743 587,373
Past service costs and other 148,253 144,481 157,765
Actuarial gain for changes in experience (8,945) (22,599) (7,222)
Actuarial loss/(gain) from changes in demographic assumptions (103,987)   134,625
Actuarial (gain) loss from changes in financial assumptions 20,219 36,163 (24,890)
Net period cost 16,075,534 14,126,945 13,551,617
Actuarial gain for changes in experience (9,677) (129) (21,283,470)
Actuarial gain from changes in demographic assumptions (270) (339,657) (1,246,539)
Actuarial loss from changes in demographic assumptions 3,475,345 31,606,323 68,482
Actuarial loss from changes in financial assumptions (924,084) 7,207,072  
Changes in the asset ceiling during the period and others (542,430) (712,064) (1,055,409)
Return on plan assets greater than discount rate (shortfall) 12,320,777 423,514 23,503,296
Recognized in other comprehensive income 14,215,944 38,185,188 (13,640)
Contributions to the pension plan made by the Company (1,882,654) (1,337,610) (1,565,792)
Payments to employees (14,426,720) (16,996,920) (10,651,938)
Effect of translation 168,219 (1,399,497) (1,145,960)
Others (16,141,155) (19,734,027) (13,363,690)
Balance at the end of the year 154,847,297 140,696,974 108,118,868
Less short-term portion (268,940) (213,065) (212,141)
Non-current obligation 154,578,357 140,483,909 107,906,727
Defined benefit obligation [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year 342,569,774 306,702,447 329,113,625
Current service cost 2,810,584 2,591,975 3,322,813
Interest cost on projected benefit obligation 30,482,173 31,001,348 30,185,257
Actuarial gain for changes in experience (8,945) (22,599) (7,222)
Actuarial loss/(gain) from changes in demographic assumptions (103,987)   134,625
Actuarial (gain) loss from changes in financial assumptions 20,219 36,163 (24,890)
Net period cost 33,303,761 33,606,758 33,610,583
Actuarial gain for changes in experience (9,677) (129) (21,283,470)
Actuarial gain from changes in demographic assumptions (270) (339,657) (1,246,539)
Actuarial loss from changes in demographic assumptions 3,475,345 31,606,323 68,482
Actuarial loss from changes in financial assumptions (924,084) 7,207,072  
Recognized in other comprehensive income 2,437,597 38,473,738 (22,461,527)
Contributions made by plan participants 137,947 155,188 173,722
Benefits paid (19,740,727) (15,836,928) (19,546,541)
Payments to employees (14,426,720) (16,996,920) (10,651,938)
Effect of translation (1,278,392) (3,534,509) (3,535,477)
Others (35,307,892) (36,213,169) (33,560,234)
Balance at the end of the year 343,003,240 342,569,774 306,702,447
Less short-term portion (268,940) (213,065) (212,141)
Non-current obligation 342,734,300 342,356,709 306,490,306
Plan assets [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year (206,300,821) (203,671,122) (227,688,604)
Expected return on plan assets (17,655,119) (20,070,037) (20,804,104)
Past service costs and other 148,253 144,481 157,765
Net period cost (17,506,866) (19,925,556) (20,646,339)
Return on plan assets greater than discount rate (shortfall) 12,320,777 423,514 23,503,296
Recognized in other comprehensive income 12,320,777 423,514 23,503,296
Contributions made by plan participants (137,947) (155,188) (173,722)
Contributions to the pension plan made by the Company (1,882,654) (1,337,610) (1,565,792)
Benefits paid 19,740,727 15,836,928 19,546,541
Effect of translation 2,217,201 2,528,213 3,353,498
Others 19,937,327 16,872,343 21,160,525
Balance at the end of the year (191,549,583) (206,300,821) (203,671,122)
Non-current obligation (191,549,583) (206,300,821) (203,671,122)
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 4,428,021 5,087,543 6,519,560
Changes in the asset ceiling during the period and others 278,639 445,743 587,373
Net period cost 278,639 445,743 587,373
Changes in the asset ceiling during the period and others (542,430) (712,064) (1,055,409)
Recognized in other comprehensive income (542,430) (712,064) (1,055,409)
Effect of translation (770,590) (393,201) (963,981)
Others (770,590) (393,201) (963,981)
Balance at the end of the year 3,393,640 4,428,021 5,087,543
Non-current obligation $ 3,393,640 $ 4,428,021 $ 5,087,543