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Equity Method Accounted Investees - Share of OCI (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Items that may be reclassified to consolidated net income:        
Total $ 143 $ 2,925 $ (5,948) $ 1,058
Items that may not be reclassified to consolidated net income in subsequent periods:        
Gain (loss) on remeasurements of the net defined benefit liability $ 14 296 (474) (1,090)
Equity investments        
Items that may be reclassified to consolidated net income:        
Fair value changes   32 (14)  
Exchange differences on translating foreign operations   2,893 (5,934) 1,058
Total   2,925 (5,948) 1,058
Items that may not be reclassified to consolidated net income in subsequent periods:        
Gain (loss) on remeasurements of the net defined benefit liability   $ 590 $ (111) $ (389)