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Non-Controlling Interest in Consolidated Subsidiaries - Rollforward (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance   $ 325,751    
Consolidated net income $ 188 3,756 $ 28,048 $ 33,079
Total other comprehensive income (369) (7,321) (12,966) (13,293)
Remeasurements of the net defined benefit liability (24) (474) (1,090) 551
Dividends declared and paid   (15,884) (13,637) (12,933)
Issuance (purchase) of share-based compensation plans   (339) 21 73
Other acquisitions and remeasurements   1,298 32  
Derecognition upon disposal of controlling interest in Philippines       (11,140)
Ending Balance $ 15,442 307,187 325,751  
IAS 29 [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance       2,687
Total controlling interest [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance   251,989    
Consolidated net income   (1,930) 20,699 23,990
Dividends declared and paid   (10,360) (9,692) (9,220)
Issuance (purchase) of share-based compensation plans   (275) 33 42
Other acquisitions and remeasurements   (79)    
Ending Balance   237,743 251,989  
Total controlling interest [member] | Synergy [Member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Other acquisitions and remeasurements   79    
Total controlling interest [member] | IAS 29 [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance       1,269
Non-controlling interest [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance   73,762 78,489 86,621
Consolidated net income   5,686 7,349 9,089
Total other comprehensive income   (5,793) (4,552) (4,080)
Exchange differences on translating foreign operations   (5,958) (3,833) (4,016)
Remeasurements of the net defined benefit liability   (169) (271) 155
Fair value changes   334 (448) (219)
Dividends declared and paid   (5,524) (3,945) (3,713)
Issuance (purchase) of share-based compensation plans   (64) (12) 31
Acquisitions of non-controlling interest   1,298 3,530  
Other acquisitions and remeasurements   1,377 32 413
Derecognition upon disposal of controlling interest in Philippines       (11,140)
Recognition of non-controlling interest upon consolidation of CCFPI       (11,140)
Ending Balance   $ 69,444 73,762 78,489
Non-controlling interest [member] | Accounting standard adoption effects [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance     $ (69) (150)
Ending Balance       (69)
Non-controlling interest [member] | IAS 29 [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance       $ 1,418