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Income Taxes - Schedule of Deferred Income Tax (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2015
MXN ($)
Disclosure of income taxes [Line Items]          
Deferred income taxes, net $ (10,657) $ (9,720) $ (1,016)   $ (2,063)
Deferred tax asset (16,543) (15,853)   $ (843)  
Deferred tax liability 5,886 6,133   $ 300  
Deferred income tax related to consolidated statement of income (296) (8,355) (5,589)    
Deferred tax income net recorded in share of the profit of equity accounted investees (15) (24) (71)    
Deferred tax income, net (311) (8,379) (5,660)    
Allowance for doubtful accounts [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (416) (152)      
Deferred income tax related to consolidated statement of income 93 16 (17)    
Inventory [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 80 (151)      
Deferred income tax related to consolidated statement of income (27) (71) (151)    
Other current assets [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 75 101      
Deferred income tax related to consolidated statement of income (31) 34 (80)    
Property, plant and equipment [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (3,841) (2,733)      
Deferred income tax related to consolidated statement of income (851) (2,349) 670    
Investments in equity accounted investees [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (5,979) (6,989)      
Deferred income tax related to consolidated statement of income 40 (5,094) 75    
Other assets [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 212 254      
Deferred income tax related to consolidated statement of income (82) (155) 234    
Finite useful lived intangible assets [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 271 894      
Deferred income tax related to consolidated statement of income 627 207 (1,506)    
Indefinite lived intangible assets [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 10,331 9,957      
Deferred income tax related to consolidated statement of income 758 968 7,391    
Post-employment and other long-term employee benefits [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (1,058) (965)      
Deferred income tax related to consolidated statement of income (148) (77) (34)    
Derivative financial instruments [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 21 84      
Deferred income tax related to consolidated statement of income (63) (171) 128    
Provisions [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (2,761) (3,500)      
Deferred income tax related to consolidated statement of income 1,122 (636) (411)    
Temporary non-deductible provision [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (1,400) (222)      
Deferred income tax related to consolidated statement of income (293) (144) (9,118)    
Employee profit sharing payable [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (403) (351)      
Deferred income tax related to consolidated statement of income (27) (11) (29)    
Tax loss carry forwards [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (9,558) (10,218)      
Deferred income tax related to consolidated statement of income (927) (547) (1,693)    
Tax credits to recover [Member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net (1,855) (2,308)      
Deferred income tax related to consolidated statement of income (109) (1,059) (1,150)    
Other comprehensive income [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 229 239      
Deferred income tax related to consolidated statement of income (54) (224)      
Exchange differences on translation of foreign operations in OCI [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 5,202 7,168      
Other liabilities [member]          
Disclosure of income taxes [Line Items]          
Deferred income taxes, net 193 (828)      
Deferred income tax related to consolidated statement of income $ (324) $ 948 $ 102    
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3