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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 ($)
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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

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