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Equity Accounted Investees - Share of OCI (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Items that may be reclassified to consolidated net income:        
Total $ (299) $ (5,948) $ 1,058 $ (360)
Items that may not be reclassified to consolidated net income in subsequent periods:        
Remeasurements of the net defined benefit liability $ (24) (474) (1,090) 551
Equity investments [member]        
Items that may be reclassified to consolidated net income:        
Fair value changes   (14)   (355)
Exchange differences on translating foreign operations   (5,934) 1,058 (5)
Total   (5,948) 1,058 (360)
Items that may not be reclassified to consolidated net income in subsequent periods:        
Remeasurements of the net defined benefit liability   $ (111) $ (389) $ 597