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Other Assets and Other Financial Assets - Other financial assets (Details)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Categories of financial assets [abstract]      
Non-current accounts receivable   $ 983 $ 938
Derivative financial instruments (see Note 21)   14,283 8,260
Others   334 172
Other investments in equity instruments   16,786 13,310
Total other financial assets $ 1,628 $ 32,386 $ 22,680