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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year $ 128,400,391 $ 131,410,989 $ 154,847,297
Current service cost 2,044,102 1,534,180 2,090,896
Interest cost on projected benefit obligation 33,203,706 30,565,134 28,913,257
Expected return on plan assets (20,251,931) (18,819,322) (15,112,669)
Changes in the asset ceiling during the period and others 585,667 398,399 215,544
Past service costs and other (177,054) 142,911 139,910
Actuarial gain for changes in experience (20,645) (43,603) (23,024)
Actuarial (gain) loss from changes in demographic assumption 134 (64) (48)
Actuarial (gain) loss from changes in financial assumptions 30,958 (88,990) (6,907)
Net period cost 15,414,937 13,688,645 16,216,959
Actuarial loss for changes in experience 10,632,144 2,747,706 10,728,950
Actuarial loss/(gain) from changes in demographic assumptions (430,315) 55,037 (104,568)
Actuarial (gain)/loss from changes in financial assumptions 1,900,436 (9,838,708) (4,099,321)
Changes in the asset ceiling during the period and others (2,247,990) 1,283,501 969,433
Return on plan assets greater than discount rate (shortfall) (6,210,593) 13,719,181 (22,198,615)
Recognized in other comprehensive income 3,643,682 7,966,717 (14,704,121)
Contributions to the pension plan made by the Company (10,853) 516,280 311,108
Benefits paid (297,159) (281,579) (225,876)
Payments to employees (10,868,600) (23,753,735) (25,042,314)
Plan changes (29,383) 12,461  
Effect of translation (1,832,409) (1,159,387) 7,936
Others (13,038,404) (24,665,960) (24,949,146)
Balance at the end of the year 134,420,606 128,400,391 131,410,989
Less short-term portion (232,102) (275,209) (236,304)
Non-current obligation 134,188,504 128,125,182 131,174,685
Defined benefit obligation [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year 330,862,941 345,315,712 343,003,240
Current service cost 2,044,102 1,534,180 2,090,896
Interest cost on projected benefit obligation 33,203,706 30,565,134 28,913,257
Past service costs and other (322,700)    
Actuarial gain for changes in experience (20,645) (43,603) (23,024)
Actuarial (gain) loss from changes in demographic assumption 134 (64) (48)
Actuarial (gain) loss from changes in financial assumptions 30,958 (88,990) (6,907)
Net period cost 34,935,555 31,966,657 30,974,174
Actuarial loss for changes in experience 10,632,144 2,747,706 10,728,950
Actuarial loss/(gain) from changes in demographic assumptions (430,315) 55,037 (104,568)
Actuarial (gain)/loss from changes in financial assumptions 1,900,436 (9,838,708) (4,099,321)
Return on plan assets greater than discount rate (shortfall)     (22,198,615)
Recognized in other comprehensive income 12,102,265 (7,035,965) 6,525,061
Contributions made by plan participants 45,404 78,642 99,201
Benefits paid (27,844,968) (13,502,781) (10,574,420)
Payments to employees (10,868,600) (23,753,735) (25,042,314)
Plan changes (29,383) 12,461  
Effect of translation (4,745,061) (2,218,050) 330,770
Others (43,442,608) (39,383,463) (35,186,763)
Balance at the end of the year 334,458,153 330,862,941 345,315,712
Less short-term portion (232,102) (275,209) (236,304)
Non-current obligation 334,226,051 330,587,732 345,079,408
Plan assets [member]      
Disclosure of actuarial results generated for the pension and retirement plans [line items]      
Balance at the beginning of the year (208,526,619) (218,327,182) (191,549,583)
Expected return on plan assets (20,251,931) (18,819,322) (15,112,669)
Past service costs and other 145,646 142,911 139,910
Net period cost (20,106,285) (18,676,411) (14,972,759)
Return on plan assets greater than discount rate (shortfall) (6,210,593) 13,719,181  
Recognized in other comprehensive income (6,210,593) 13,719,181 (22,198,615)
Contributions made by plan participants (45,404) (78,642) (99,201)
Contributions to the pension plan made by the Company (10,853) 516,280 311,108
Benefits paid 27,547,809 13,221,202 10,348,544
Effect of translation 3,259,358 1,098,953 (166,676)
Others 30,750,910 14,757,793 10,393,775
Balance at the end of the year (204,092,587) (208,526,619) (218,327,182)
Non-current obligation (204,092,587) (208,526,619) (218,327,182)
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 6,064,069 4,422,459 3,393,640
Changes in the asset ceiling during the period and others 585,667 398,399 215,544
Net period cost 585,667 398,399 215,544
Changes in the asset ceiling during the period and others (2,247,990) 1,283,501 969,433
Recognized in other comprehensive income (2,247,990) 1,283,501 969,433
Effect of translation (346,706) (40,290) (156,158)
Others (346,706) (40,290) (156,158)
Balance at the end of the year 4,055,040 6,064,069 4,422,459
Non-current obligation $ 4,055,040 $ 6,064,069 $ 4,422,459