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Basis of Preparation - Cash Flow Reconciliation (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of Detailed Information About Investment Property [line items]        
Amortization $ 51 $ 1,020 $ 1,062 [2] $ 998
Amortization prepaid expenses 29 577 638 [2] 626
Other tax 159 3,162 404 [2] 6
Income taxes paid (251) (4,990) (5,210) [2] (6,188)
Acquisitions of intangible assets (15) (289) (698) [2] (674)
Other non-current assets $ (16) $ (325) (711) [2] (681)
Previously Reported        
Disclosure of Detailed Information About Investment Property [line items]        
Amortization     1,700 1,624
Income taxes paid     (4,806) (6,182)
Acquisitions of intangible assets     (1,421) (1,373)
Other non-current assets     $ (12) $ (18)
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18