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Financial Instruments - Reconciliation Per Category of Equity Components and Analysis of OCI Components, Net of Tax Generated by Cash Flow Hedges (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about hedged items [line items] |  |  |
Taxes due to changes in reserves during the period | $ (293) | $ (191) | $ 745
Hedging reserve [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Balances at beginning of the period | 1,384 |  |
Taxes due to changes in reserves during the period | 294 |  |
Balances at the end of the period | 812 | 1,384 |
Hedging reserve [member] | Foreign exchange currency risk [member] | Purchase of stock [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Fair value changes | (132) |  |
Hedging reserve [member] | Foreign exchange currency risk [member] | Other stock [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Fair value changes | (462) |  |
Hedging reserve [member] | Interest rate risk [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Fair value changes | (273) |  |
Cost of hedging reserve [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Balances at beginning of the period | 12 |  |
Balances at the end of the period | 24 | $ 12 |
Cost of hedging reserve [member] | Foreign exchange currency risk [member] | Purchase of stock [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Fair value changes | $ 12 |  |

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