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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 |  |
--- | --- | --- | ---
Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2015 MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred tax, asset | $ (8,438) | $ (8,012) |  | $ (430) |
Deferred tax, liability | 2,856 | 1,714 |  | $ 145 |
Deferred income tax related to consolidated statement of financial position | (5,582) | (6,298) | $ (4,776) |  | $ (2,975)
Deferred income tax related to consolidated statement of income | 497 | (1,924) | (4,646) |  |
Allowance for doubtful accounts [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (33) | (119) |  |  |
Deferred income tax related to consolidated statement of income | 76 | 16 | (8) |  |
Inventory [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (32) | (4) |  |  |
Deferred income tax related to consolidated statement of income | (33) | (60) | (163) |  |
Prepaid expenses [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | 3 | 17 |  |  |
Deferred income tax related to consolidated statement of income | (19) | 5 | (71) |  |
Property, plant and equipment [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (1,051) | (244) |  |  |
Deferred income tax related to consolidated statement of income | (392) | (1,783) | 1,439 |  |
Other assets [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | 38 | (569) |  |  |
Deferred income tax related to consolidated statement of income | 74 | (166) | 167 |  |
Finite useful lived intangible assets [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | 225 | 820 |  |  |
Deferred income tax related to consolidated statement of income | 182 | 761 | (289) |  |
Indefinite lived intangible assets 1 [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | 1,081 | 2,143 |  |  |
Deferred income tax related to consolidated statement of income | 31 | 743 | 5,280 |  |
Post employment and other long term employee benefits [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (457) | (474) |  |  |
Deferred income tax related to consolidated statement of income | (114) | (56) | (1) |  |
Derivative financial instruments [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | 3 | 42 |  |  |
Deferred income tax related to consolidated statement of income | (39) | (44) | 62 |  |
Contingencies [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (2,209) | (2,629) |  |  |
Deferred income tax related to consolidated statement of income | 1,146 | (886) | (96) |  |
Employee profit sharing payable [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (184) | (159) |  |  |
Deferred income tax related to consolidated statement of income |  | 6 | (14) |  |
Tax loss carry forwards [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (8,358) | (8,088) |  |  |
Deferred income tax related to consolidated statement of income | (1,082) | (13) | (1,834) |  |
Tax credits to recover [member] |  |  |  |  |
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) | (2,308) |  |  |
Deferred income tax related to consolidated statement of income | (109) | (1,159) | (1,150) |  |
Accumulated other comprehensive income [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | (184) | (141) |  |  |
Deferred income tax related to consolidated statement of income | (54) | (224) |  |  |
Liabilities of amortization of goodwill of business acquisition [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | 7,299 | 5,527 |  |  |
Deferred income tax related to consolidated statement of income | 1,125 | (554) | (1,876) |  |
Other Liabilities [member] |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred income tax related to consolidated statement of financial position | 132 | (112) |  |  |
Deferred income tax related to consolidated statement of income | $ (295) | $ 1,490 | $ (6,092) |  |

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