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Taxes - Deferred income tax in financial statements (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   $ (13,575) $ (10,657)   $ (16,010) $ (9,720)
Deferred income tax related to consolidated statement of income $ (4,071) (1,583) (296)      
Deferred tax income net recorded in share of the profit of equity accounted investees 200 407 (15)      
Total deferred tax income expense $ (3,871) (1,176) (311)      
Deferred tax asset   (20,521)   $ (1,108) (22,043)  
Deferred tax liability   6,946   $ 303 6,033  
Deferred tax recovery period 10 years          
Allowance for doubtful accounts [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (437)     (501)  
Deferred income tax related to consolidated statement of income $ (25) (43) 93      
Inventory [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   76     (757)  
Deferred income tax related to consolidated statement of income 60 (6) (27)      
Other Current Assets [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   256     122  
Deferred income tax related to consolidated statement of income (163) 182 (31)      
Property, plant and equipment [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (4,068)     (4,999)  
Deferred income tax related to consolidated statement of income (708) (320) (851)      
Investments in equity accounted investees [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (5,482)     (9,321)  
Deferred income tax related to consolidated statement of income (15) 7 40      
Other assets [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   137     (681)  
Deferred income tax related to consolidated statement of income (729) 59 (82)      
Finite useful lived intangible assets [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (111)     (181)  
Deferred income tax related to consolidated statement of income 129 (345) 627      
Indefinite lived intangible assets [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   10,788     9,316  
Deferred income tax related to consolidated statement of income (261) 1,220 758      
Post-employment and other long-term employee benefits [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (1,067)     (1,124)  
Deferred income tax related to consolidated statement of income (37) (2) (148)      
Derivative Financial Instruments [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (9)     (121)  
Deferred income tax related to consolidated statement of income (114) (31) (63)      
Provisions [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (1,216)     1,135  
Deferred income tax related to consolidated statement of income 142 1,359 1,122      
Temporary non-deductible provision [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (3,183)     (4,907)  
Deferred income tax related to consolidated statement of income (1,893) (1,797) (293)      
Employee profit sharing payable [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (430)     (371)  
Deferred income tax related to consolidated statement of income 64 8 (27)      
Tax loss carry forwards [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (10,309)     (8,422)  
Deferred income tax related to consolidated statement of income 1,994 (1,201) (927)      
Tax credits to recover [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (1,855)     (2,595)  
Deferred income tax related to consolidated statement of income (1,629) (122) (109)      
Other comprehensive income [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (596)     33  
Deferred income tax related to consolidated statement of income 86 29 (54)      
Exchange differences on translation of foreign operations in OCI [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   3,959     7,697  
Other Liabilities [Member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   533     717  
Deferred income tax related to consolidated statement of income (440) (3) $ (324)      
Right of use assets from leases [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (561)     $ (1,049)  
Deferred income tax related to consolidated statement of income $ (532) $ (577)