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Non-Controlling Interest in Consolidated Subsidiaries - Rollforward (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance   $ 307,187 $ 325,751  
Consolidated net income $ 1,836 37,678 3,756 $ 28,048
Other items of comprehensive income (loss), net of tax 174 3,560 (7,321) (12,966)
Gain (loss) on remeasurements of the net defined benefit liability 14 296 (474) (1,090)
Dividends declared and paid   (13,416) (15,884) (13,637)
Issuance of share-based compensation plans   40 (339) 21
Other acquisitions and remeasurements     1,298 32
Ending Balance $ 16,336 335,117 307,187 325,751
Total controlling interest        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance   237,743 251,989  
Consolidated net income   28,495 (1,930) 20,699
Dividends declared and paid   (7,687) (10,360) (9,692)
Issuance of share-based compensation plans   54 (275) 33
Other acquisitions and remeasurements     (79)  
Ending Balance   262,601 237,743 251,989
Non-controlling interest        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance   69,444 73,762 78,489
Consolidated net income   9,183 5,686 7,349
Other items of comprehensive income (loss), net of tax   (368) (5,793) (4,552)
Exchange differences on translating foreign operations   (1,342) (5,958) (3,833)
Gain (loss) on remeasurements of the net defined benefit liability   (36) (169) (271)
Fair value changes   1,010 334 (448)
Dividends declared and paid   (5,729) (5,524) (3,945)
Issuance of share-based compensation plans   (14) (64) (12)
Acquisitions of non-controlling interest     1,298 3,530
Other acquisitions and remeasurements     1,377 32
Ending Balance   $ 72,516 69,444 73,762
Non-controlling interest | Synergy        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Other acquisitions and remeasurements     $ 79 32
Non-controlling interest | Accounting standard adoption effects        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Beginning Balance       $ (69)