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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets $ (108,118,868) $ (107,944,581) $ (98,020,192) $ (106,638,436)
Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 107,906,727 107,772,175    
Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 84,592,642 83,765,572    
Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 13,986,596 13,962,128    
Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 4,850,447 5,489,563    
Reportable segments [member] | Europe [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 4,477,042 4,554,912    
Defined benefit obligation [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (306,702,447) (329,113,625) (313,282,595) (314,049,729)
Defined benefit obligation [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 306,490,306 328,941,219    
Defined benefit obligation [member] | Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 247,997,060 266,304,948    
Defined benefit obligation [member] | Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 35,220,889 38,711,695    
Defined benefit obligation [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 18,795,315 19,369,664    
Defined benefit obligation [member] | Reportable segments [member] | Europe [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 4,477,042 4,554,912    
Plan assets [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 203,671,122 227,688,604 222,345,621 212,234,440
Plan assets [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (203,671,122) (227,688,604)    
Plan assets [member] | Reportable segments [member] | Mexico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (163,404,418) (182,539,376)    
Plan assets [member] | Reportable segments [member] | Puerto Rico [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (21,234,293) (24,749,567)    
Plan assets [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (19,032,411) (20,399,661)    
Effect of asset celling [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets (5,087,543) (6,519,560) $ (7,083,218) $ (4,823,147)
Effect of asset celling [member] | Reportable segments [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets 5,087,543 6,519,560    
Effect of asset celling [member] | Reportable segments [member] | Brazil [member]        
Disclosure of defined benefit plans [line items]        
Defined benefit obligation and plan assets $ 5,087,543 $ 6,519,560