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Income Taxes - Summary of Temporary Differences Giving Rise to Deferred Income Tax Liabilities (Assets) (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2020 USD ($) | [2] | Dec. 31, 2020 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred tax, asset |  | $ (10,432) | [1] |  | $ (560) | $ (11,143) |
Deferred tax liabilities |  | 3,771 | [1] |  | $ 124 | 2,474 |
Deferred income tax related to consolidated statement of financial position |  | (6,661) |  | $ (5,582) |  | (8,669) | $ (6,298)
Deferred income tax related to consolidated statement of income | $ (1,939) | (363) |  | 497 |  |  |
Allowance for doubtful accounts |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (60) |  |  |  | (64) |
Deferred income tax related to consolidated statement of income | (10) | (18) |  | 76 |  |  |
Inventories |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (61) |  |  |  | 23 |
Deferred income tax related to consolidated statement of income | 72 | (37) |  | (33) |  |  |
Prepaid expenses |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | 43 |  |  |  | 26 |
Deferred income tax related to consolidated statement of income | (17) | 41 |  | (19) |  |  |
Property, plant and equipment, net |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (863) |  |  |  | (1,006) |
Deferred income tax related to consolidated statement of income | (90) | 128 |  | (392) |  |  |
Rights of use assets |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | 197 |  |  |  | 176 |
Deferred income tax related to consolidated statement of income | (22) | 197 |  | 0 |  |  |
Other assets |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | 20 |  |  |  | (325) |
Deferred income tax related to consolidated statement of income | (389) | 24 |  | 74 |  |  |
Finite useful lived intangible assets |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | 148 |  |  |  | (128) |
Deferred income tax related to consolidated statement of income | (275) | (78) |  | 182 |  |  |
Indefinite lived intangible assets |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | 1,039 |  |  |  | 796 |
Deferred income tax related to consolidated statement of income | 140 | 114 |  | 31 |  |  |
Post-employment and other non-current employee benefits |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (387) |  |  |  | (381) |
Deferred income tax related to consolidated statement of income | 4 | 65 |  | (114) |  |  |
Derivative financial instruments |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (7) |  |  |  | 74 |
Deferred income tax related to consolidated statement of income | 80 | (12) |  | (39) |  |  |
Contingencies |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (2,169) |  |  |  | (1,627) |
Deferred income tax related to consolidated statement of income | 182 | (94) |  | 1,146 |  |  |
Employee profit sharing payable |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (201) |  |  |  | (208) |
Deferred income tax related to consolidated statement of income | (7) | 17 |  | 0 |  |  |
Tax loss carryforwards |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (9,224) |  |  |  | (6,915) |
Deferred income tax related to consolidated statement of income | 2,342 | (1,268) |  | (1,082) |  |  |
Tax credits to recover |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (1,855) |  |  |  | (2,594) |
Deferred income tax related to consolidated statement of income | (1,629) | (122) |  | (109) |  |  |
Cumulative other comprehensive income |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (721) |  |  |  | (590) |
Deferred income tax related to consolidated statement of income | 86 | 29 |  | (54) |  |  |
Liabilities of amortization of goodwill of business acquisition |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | 7,663 |  |  |  | 6,554 |
Deferred income tax related to consolidated statement of income | 0 | 860 |  | 1,125 |  |  |
Financial leasing |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (190) |  |  |  | (211) |
Deferred income tax related to consolidated statement of income | (23) | (190) |  | 0 |  |  |
Other liabilities |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Deferred income tax related to consolidated statement of financial position |  | (33) |  |  |  | $ (2,269) |
Deferred income tax related to consolidated statement of income | $ (2,383) | $ (19) |  | $ (295) |  |  |
[1] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] | Convenience translation to U.S. dollars ($) – See Note 2.2.3

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