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Significant Accounting Policies - Additional Information (Detail) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2018 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Jan. 01, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Increase in deferred income tax asset |  | $ 2,349 | $ (2,578) | $ (1,376) |  |
Allowance for expected credit loss |  | 2,336 | 2,145 | 2,196 |  | $ 2,152
Deferred tax asset |  |  | 14,817 |  |  |
Contract liabilities |  | 775 | 770 | 645 |  | $ 660
Capitalization of retained earnings |  |  | 0 | 0 |  |
Share-based compensation |  | $ 706 | 817 | 742 |  |
Decrease in debt |  |  | 5,468 |  |  |
Increase (decrease) through conversion of convertible instruments |  |  | $ 5,729 |  |  |
Increase in debt and in other current accounts receivable |  |  |  | $ 148 |  |
Minimum equity interest for significant influence |  | 20.00% |  |  |  |
Useful life of intangible asset |  | 3 to 20 years |  |  |  |
Statutory income tax rate |  | 30.00% | 30.00% | 30.00% |  |
Increase (decrease) due to application of IFRS 15 [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Increase decrease in revenue |  |  | $ (8) | $ (2) |  |
Increase (decrease) due to application of IFRS 15 [member] | Other provisions [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Contract liabilities |  |  |  |  | $ 660 |
In accordance with IFRS 9 [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Increase in allowance for expected credit losses | $ 570 |  |  |  |  |
Increase in deferred income tax asset | 154 |  |  |  |  |
Allowance for expected credit loss | 2,715 |  |  |  |  |
Deferred tax asset | $ 14,971 |  |  |  |  |
Mexico [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Allowance for expected credit loss |  | $ 717 |  |  |  |
Statutory income tax rate |  | 30.00% | 30.00% | 30.00% |  |
Computer software [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Useful life of intangible asset |  | 5 years |  |  |  |
Extraction rights [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Useful life of intangible asset |  | 30 to 100 years |  |  |  |
Bottom of range [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Threshold to declare and maintain a hedge |  | 0.80 |  |  |  |
Top of range [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Threshold to declare and maintain a hedge |  | 1.25 |  |  |  |
Mobile equipment [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Carrying amount of assets acquired through capital lease |  | $ 88 | $ 2,096 | $ 7 |  |
Retained earnings [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Capitalization of retained earnings |  | 0 | (9,464) | (6,970) |  |
Share-based compensation |  | 0 | 0 | 0 |  |
Increase (decrease) through conversion of convertible instruments |  |  | 0 |  |  |
Equity Reserve [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Increase (decrease) through conversion of convertible instruments |  |  | (1,334) |  |  |
Common Stock [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Increase (decrease) through conversion of convertible instruments |  |  | 4 |  |  |
Additional paid-in capital [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Capitalization of retained earnings |  |  | 9,459 | 6,966 |  |
Share-based compensation |  | $ 668 | 791 | $ 742 |  |
Increase (decrease) through conversion of convertible instruments |  |  | $ 7,059 |  |  |
US Dollar [member] |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Closing exchange rate |  | 19.6500 | 19.6500 | 20.7200 |  |
Average exchange rate |  | 19.2583 | 18.8800 | 18.7200 |  |

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