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Financial Instruments - Additional Information - Other Financial Obligations (Detail) $ / shares in Units, $ / shares in Units, shares in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Jun. 19, 2017 MXN ($) | Mar. 30, 2017 MXN ($) | Mar. 31, 2016 MXN ($) | Mar. 26, 2015 MXN ($) | Mar. 31, 2015 USD ($) | Oct. 31, 2014 USD ($) | Dec. 31, 2017 MXN ($) shares | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Dec. 31, 2009 USD ($) $ / shares | Dec. 31, 2017 $ / shares | Jun. 19, 2017 USD ($) shares | Jun. 19, 2017 MXN ($) shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 MXN ($) | May 31, 2015 USD ($) | Mar. 13, 2015 USD ($) | Mar. 15, 2011 USD ($) | Dec. 31, 2009 MXN ($) $ / shares
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on exchange difference |  |  |  |  |  |  | $ (26,000,000) | $ 5,004,000,000 | $ 1,970,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase common stock value |  | $ 5,000,000 | $ 4,000,000 | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  | $ 9,459,000,000 | $ 6,966,000,000 | $ 7,613,000,000 |  |  | $ 140,483,000,000 |  |  |  |  |  |  |  | $ 123,174,000,000 |  |  |  |  |  |
Convertible Subordinated Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.72% | 3.72% |  |  |  |
Additional ADS issued | shares |  |  |  |  |  |  | 42 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on exchange difference |  |  |  |  |  |  |  |  | $ 365,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 11.01 |  |  | $ 11.45 |  |  |  |  |  |  |
Conversion rate per dollars |  |  |  |  |  |  | 90.8592 |  |  |  |  |  |  | 87.3646 | 87.3646 |  |  |  |  |  |
Convertible Subordinated Notes Due 2020 [Member] | Contingent Convertible Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |
Convertible Subordinated Notes Due 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 352,000,000 |  |  |  |  |  | $ 978,000,000 |
Debt interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |
Debt instrument maturity date |  |  |  |  |  |  | 2016-03 | 2016-03 |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal value of debt settled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 626,000,000 |  |  |
Convertible subordinated notes due 2015 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  | $ 204,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest percentage |  |  |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid amount |  |  |  |  | $ 204,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible subordinated notes due 2015 [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument conversion amount |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible subordinated notes due 2018 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 690,000,000 |
Debt interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% |
Debt instrument conversion amount |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  | 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ADS | shares |  |  |  |  |  |  |  |  |  |  |  | 43 | 43 |  |  |  |  |  |  |  |
Liability component of converted notes | $ 5,468,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Subordinated Notes Due Two Thousand Sixteen and Eighteen [Member] | American Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 8.57 |  |  | $ 8.92 |  |  |  |  |  |  |
Conversion rate per dollars |  |  |  |  |  |  | 116.6193 |  |  |  |  |  |  | 112.1339 | 112.1339 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 236,000,000
Mandatory Convertible Securities [Member] | Mandatory Convertible Securities 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  | $ 315,000,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 199,000,000 |  |  |  |
Parent [member] | Convertible Subordinated Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 521,000,000 |  |  |  |  |
Parent [member] | Convertible subordinated notes due 2015 [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount annual interest rate |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent [member] | Convertible subordinated notes due 2015 [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,059,000,000 |  |  |  |  |  |  |  |
Expense for inducement premiums paid in shares | $ 769,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investors [Member] | Convertible Subordinated Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 321,000,000 |  |  |
Investors [Member] | U.S. treasury bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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