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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets $ (131,410,989) $ (154,847,297) $ (140,696,974) $ (108,118,868)
Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 131,174,685 154,578,357    
Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 109,125,922 128,343,821    
Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 12,502,377 14,924,874    
Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 4,453,350 5,818,789    
Reportable segments [member] | Europe [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 5,093,036 5,490,873    
Defined benefit obligation [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (345,315,712) (343,003,240) (342,569,774) (306,702,447)
Defined benefit obligation [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 345,079,408 342,734,300    
Defined benefit obligation [member] | Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 286,396,483 278,434,302    
Defined benefit obligation [member] | Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 38,092,662 40,240,193    
Defined benefit obligation [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 15,497,227 18,568,932    
Defined benefit obligation [member] | Reportable segments [member] | Europe [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 5,093,036 5,490,873    
Plan assets [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 218,327,182 191,549,583 206,300,821 203,671,122
Plan assets [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (218,327,182) (191,549,583)    
Plan assets [member] | Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (177,270,561) (150,090,481)    
Plan assets [member] | Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (25,590,285) (25,315,319)    
Plan assets [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (15,466,336) (16,143,783)    
Effect of asset celling [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (4,422,459) (3,393,640) $ (4,428,021) $ (5,087,543)
Effect of asset celling [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 4,422,459 3,393,640    
Effect of asset celling [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets $ 4,422,459 $ 3,393,640