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Taxes - Deferred income tax in financial statements (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   $ (16,010) $ (13,575)   $ (14,691) $ (10,657)
Deferred income tax related to consolidated statement of income $ 178 (4,071) (1,583)      
Deferred tax income net recorded in share of the profit of equity method accounted investees 443 200 407      
Total deferred tax expense (benefit) $ 621 (3,871) (1,176)      
Deferred tax asset   (22,043)   $ (1,011) (20,733)  
Deferred tax liability   6,033   $ 295 6,042  
Deferred tax recovery period 10 years          
Allowance for doubtful accounts            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (501)     (35)  
Deferred income tax related to consolidated statement of income $ (3) (25) (43)      
Inventory            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (757)     206  
Deferred income tax related to consolidated statement of income (17) 60 (6)      
Other current assets.            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   122     144  
Deferred income tax related to consolidated statement of income 47 (163) 182      
Property, plant and equipment            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (4,999)     (6,495)  
Deferred income tax related to consolidated statement of income (1,081) (708) (320)      
Right of use Assets from leases            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (802)     (1,218)  
Deferred income tax related to consolidated statement of income (482) (509) (381)      
Investments in equity accounted investees            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (9,321)     (7,533)  
Deferred income tax related to consolidated statement of income (22) (15) 7      
Other assets [member]            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (681)     192  
Deferred income tax related to consolidated statement of income (2) (729) 59      
Finite useful lived intangible assets            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (181)     297  
Deferred income tax related to consolidated statement of income 498 129 (345)      
Indefinite lived intangible assets            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   2,762     3,038  
Deferred income tax related to consolidated statement of income 36 (261) 360      
Post-employment and other long-term employee benefits            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (1,886)     (1,746)  
Deferred income tax related to consolidated statement of income (258) (175) (2)      
Derivative Financial Instruments            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   674     1,622  
Deferred income tax related to consolidated statement of income 738 111 (2)      
Temporary non-deductible provision            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (3,772)     (3,443)  
Deferred income tax related to consolidated statement of income 1,280 (1,751) (438)      
Employee profit sharing payable            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (371)     (759)  
Deferred income tax related to consolidated statement of income (393) 64 8      
Tax loss carry forwards            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (8,422)     (9,047)  
Deferred income tax related to consolidated statement of income (1,498) 1,994 (1,201)      
Tax credits to recover            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (2,595)     (1,394)  
Deferred income tax related to consolidated statement of income 1,200 (1,629) (122)      
Exchange differences on translation of foreign operations in OCI            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   7,679     8,170  
Other liabilities            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   736     (2,668)  
Deferred income tax related to consolidated statement of income (4) (440) (3)      
Finance leases            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   (247)     (220)  
Deferred income tax related to consolidated statement of income 53 (24) (196)      
Liabilities of amortization of goodwill of business acquisition            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   6,552     6,198  
Deferred income tax related to consolidated statement of income $ 86   $ 860      
Other comprehensive income            
Disclosure of income taxes [Line Items]            
Deferred tax (liability)/asset, net   $ 3,571     $ 4,623