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Financial Instruments - Additional Information - Other Financial Obligations (Detail) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions, $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |  |
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Jun. 19, 2017 MXN ($) shares | Mar. 30, 2017 MXN ($) | Mar. 31, 2016 MXN ($) | Mar. 15, 2011 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 | Dec. 31, 2009 MXN ($) $ / shares | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | Jun. 19, 2017 USD ($) shares | Dec. 31, 2015 MXN ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2009 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase common stock value |  | $ 5 | $ 4 |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  | $ 9,459 | $ 6,966 |  | $ 140,483 |  |  | $ 141,151 |  |  |  |  |  |
Convertible Subordinated Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest percentage |  |  |  |  |  |  |  |  |  |  |  | 3.72% | 3.72% |
Conversion price | $ / shares |  |  |  |  |  |  |  |  | $ 11.01 | $ 11.01 |  |  |  |
Conversion rate per dollars |  |  |  |  | 90.8592 |  |  | 90.8592 |  |  |  |  |  |
Convertible subordinated notes due 2018 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  | $ 690 |  |  |  |  |  |  |  |  |  |
Debt interest percentage |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  | 2018 |  |  |  |  |  |  |  |  |
Debt instrument conversion amount |  |  |  |  |  |  |  |  |  |  | $ 325 |  |  |
Issuance of ADS | shares | 43 |  |  |  |  |  |  |  |  |  | 43 |  |  |
Liability component of converted notes | $ 5,468 |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory Convertible Securities [Member] | CPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  |  |  | $ 17.48 |  |  |  |  |  |  |
Rate required for converting the note per CPO | $ / shares |  |  |  |  |  |  | $ 26.22 |  |  |  |  |  |  |
Nominal value of securities converted |  |  |  |  |  |  | $ 236 |  |  |  |  |  |  |
Mandatory Convertible Securities [Member] | Mandatory Convertible Securities 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 315
Debt interest percentage |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  | 10.00%
Debt instrument maturity date |  |  |  |  |  | 2019 |  |  |  |  |  |  |  |
Reserve of Equity Component of Convertible Instruments [Member] | Convertible Subordinated Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of conversion price |  |  |  |  |  |  |  |  |  |  |  | $ 199 |  |
Parent [member] | Convertible Subordinated Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 521 |
Parent [member] | Convertible subordinated notes due 2018 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase common stock value | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital | 7,059 |  |  |  |  |  |  |  |  |  |  |  |  |
Expense for inducement premiums paid in shares | $ 769 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  | $ 365 |  |  |  |  |  |  |  |  |  |

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