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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year $ 154,847,297 $ 140,696,974 $ 108,118,868
Current service cost 2,090,896 2,810,584 2,591,975
Interest cost on projected benefit obligation 28,913,257 30,482,173 31,001,348
Expected return on plan assets (15,112,669) (17,655,119) (20,070,037)
Changes in the asset ceiling during the period and others 215,544 278,639 445,743
Past service costs and other 139,910 148,253 144,481
Actuarial gain for changes in experience (23,024) (8,945) (22,599)
Actuarial loss/(gain) from changes in demographic assumptions (48) (270) (129)
Actuarial (gain) loss from changes in financial assumptions (6,907) 20,219 36,163
Net period cost 16,216,959 16,075,534 14,126,945
Actuarial loss for changes in experience 10,728,950   31,606,323
Actuarial gain for changes in experience   (9,677)  
Actuarial gain from changes in demographic assumptions (104,568) (103,987) (339,657)
Others   (924,084)  
Actuarial loss from changes in financial assumptions (4,099,321) 3,475,345 7,207,072
Changes in the asset ceiling during the period and others 969,433 (542,430) (712,064)
Return on plan assets greater than discount rate (shortfall) (22,198,615) 12,320,777 423,514
Recognized in other comprehensive income (14,704,121) 14,215,944 38,185,188
Contributions to the pension plan made by the Company 311,108 (1,882,654) (1,337,610)
Benefits paid (225,876)    
Payments to employees (25,042,314) (14,426,720) (16,996,920)
Effect of translation 7,936 168,219 (1,399,497)
Others (24,949,146) (16,141,155) (19,734,027)
Balance at the end of the year 131,410,989 154,847,297 140,696,974
Less short-term portion (236,304) (268,940) (213,065)
Non-current obligation 131,174,685 154,578,357 140,483,909
Defined benefit obligation [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year 343,003,240 342,569,774 306,702,447
Current service cost 2,090,896 2,810,584 2,591,975
Interest cost on projected benefit obligation 28,913,257 30,482,173 31,001,348
Actuarial gain for changes in experience (23,024) (8,945) (22,599)
Actuarial loss/(gain) from changes in demographic assumptions (48) (270) (129)
Actuarial (gain) loss from changes in financial assumptions (6,907) 20,219 36,163
Net period cost 30,974,174 33,303,761 33,606,758
Actuarial loss for changes in experience 10,728,950   31,606,323
Actuarial gain for changes in experience   (9,677)  
Actuarial gain from changes in demographic assumptions (104,568) (103,987) (339,657)
Others   (924,084)  
Actuarial loss from changes in financial assumptions (4,099,321) 3,475,345 7,207,072
Recognized in other comprehensive income 6,525,061 2,437,597 38,473,738
Contributions made by plan participants 99,201 137,947 155,188
Benefits paid (10,574,420) (19,740,727) (15,836,928)
Payments to employees (25,042,314) (14,426,720) (16,996,920)
Effect of translation 330,770 (1,278,392) (3,534,509)
Others (35,186,763) (35,307,892) (36,213,169)
Balance at the end of the year 345,315,712 343,003,240 342,569,774
Less short-term portion (236,304) (268,940) (213,065)
Non-current obligation 345,079,408 342,734,300 342,356,709
Plan assets [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year (191,549,583) (206,300,821) (203,671,122)
Expected return on plan assets (15,112,669) (17,655,119) (20,070,037)
Past service costs and other 139,910 148,253 144,481
Net period cost (14,972,759) (17,506,866) (19,925,556)
Return on plan assets greater than discount rate (shortfall) (22,198,615) 12,320,777 423,514
Recognized in other comprehensive income (22,198,615) 12,320,777 423,514
Contributions made by plan participants (99,201) (137,947) (155,188)
Contributions to the pension plan made by the Company 311,108 (1,882,654) (1,337,610)
Benefits paid 10,348,544 19,740,727 15,836,928
Effect of translation (166,676) 2,217,201 2,528,213
Others 10,393,775 19,937,327 16,872,343
Balance at the end of the year (218,327,182) (191,549,583) (206,300,821)
Non-current obligation (218,327,182) (191,549,583) (206,300,821)
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 3,393,640 4,428,021 5,087,543
Changes in the asset ceiling during the period and others 215,544 278,639 445,743
Net period cost 215,544 278,639 445,743
Changes in the asset ceiling during the period and others 969,433 (542,430)  
Recognized in other comprehensive income 969,433 (542,430) (712,064)
Effect of translation (156,158) (770,590) (393,201)
Others (156,158) (770,590) (393,201)
Balance at the end of the year 4,422,459 3,393,640 4,428,021
Non-current obligation $ 4,422,459 $ 3,393,640 $ 4,428,021