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Income Taxes - Schedule of Deferred Income Tax (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
USD ($)
 [1]
Jan. 01, 2015
MXN ($)
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position $ (9,720) $ (1,016) $ (2,063)   $ (2,635)
Deferred tax asset (15,853) (12,053)   $ (807)  
Deferred tax liability 6,133 11,037   $ 312  
Deferred income tax related to consolidated statement of income (8,194) (5,589) (1,264)    
Deferred tax income net recorded in share of the profit of associates and joint ventures accounted for using the equity method (24) (71) (683)    
Deferred tax income, net (8,218) (5,660) (1,947)    
Allowance for doubtful accounts [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (152) (172)      
Deferred income tax related to consolidated statement of income 16 (17) 93    
Inventory [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (151) (112)      
Deferred income tax related to consolidated statement of income (1) (151) (14)    
Other current assets [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position 101 64      
Deferred income tax related to consolidated statement of income 34 (80) 21    
Property, plant and equipment [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (2,733) (471)      
Deferred income tax related to consolidated statement of income (2,537) 670 (314)    
Investments in associates and joint ventures [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (6,989) (1,227)      
Deferred income tax related to consolidated statement of income (5,094) 75 684    
Other assets [member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position 254 257      
Deferred income tax related to consolidated statement of income (155) 234 (52)    
Finite useful lived intangible assets [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position 894 201      
Deferred income tax related to consolidated statement of income 207 (1,506) 201    
Indefinite lived intangible assets [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position 9,957 9,376      
Deferred income tax related to consolidated statement of income 968 7,391 84    
Post-employment and other long-term employee benefits [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (965) (692)      
Deferred income tax related to consolidated statement of income (217) (34) 86    
Derivative financial instruments [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position 84 255      
Deferred income tax related to consolidated statement of income (171) 128 165    
Provisions [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (3,500) (2,956)      
Deferred income tax related to consolidated statement of income (557) (411) (8)    
Temporary non-deductible provision [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (222) (3,450)      
Deferred income tax related to consolidated statement of income (144) (9,118) 735    
Employee profit sharing payable [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (351) (340)      
Deferred income tax related to consolidated statement of income (11) (29) (43)    
Tax loss carry forwards [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (10,218) (8,889)      
Deferred income tax related to consolidated statement of income (823) (1,693) (2,789)    
Tax credits to recover [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (2,308) (1,150)      
Deferred income tax related to consolidated statement of income (705) (1,150)      
Cumulative other comprehensive income [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position 239 537      
Deferred income tax related to consolidated statement of income (224)        
Exchange differences on translation of foreign operations and associates [member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position 7,168 7,694      
Other liabilities [Member]          
Disclosure of income taxes [Line Items]          
Deferred income tax related to consolidated statement of financial position (828) 59      
Deferred income tax related to consolidated statement of income $ 1,220 $ 102 $ (113)    
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3