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Employee Benefits - Summary of Defined Benefit Obligation (DBO) and Plan Assets for Pension and Other Benefit Obligation Plans (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets $ (128,400,391) $ (131,410,989) $ (154,847,297) $ (140,696,974)
Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 128,125,182 131,174,685    
Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 110,960,878 109,125,922    
Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 8,859,265 12,502,377    
Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 4,840,262 4,453,350    
Reportable segments [member] | Europe [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 3,464,777 5,093,036    
Defined benefit obligation [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (330,862,941) (345,315,712) (343,003,240) (342,569,774)
Defined benefit obligation [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 330,587,732 345,079,408    
Defined benefit obligation [member] | Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 285,775,547 286,396,483    
Defined benefit obligation [member] | Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 26,747,454 38,092,662    
Defined benefit obligation [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 14,599,954 15,497,227    
Defined benefit obligation [member] | Reportable segments [member] | Europe [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 3,464,777 5,093,036    
Plan assets [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 208,526,619 218,327,182 191,549,583 206,300,821
Plan assets [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (208,526,619) (218,327,182)    
Plan assets [member] | Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (174,814,669) (177,270,561)    
Plan assets [member] | Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (17,888,189) (25,590,285)    
Plan assets [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (15,823,761) (15,466,336)    
Effect of asset celling [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (6,064,069) (4,422,459) $ (3,393,640) $ (4,428,021)
Effect of asset celling [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 6,064,069 4,422,459    
Effect of asset celling [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets $ 6,064,069 $ 4,422,459