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Financial Instruments - Disclosure of Outstanding Interest Rate Swap Agreements (Detail) - Interest rate swap [member] - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
1-2 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | $ 4,089 |
Fair Value Liability | (35) |
2-3 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 3,669 | $ 77
Fair Value Liability | (17) | (4)
3-4 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 3,709 |
Fair Value Liability | (103) |
4-5 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 875 | 727
Fair Value Liability | (34) | (87)
5-6 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 13,328 | 929
Fair Value Liability | (77) | (35)
Fair Value Asset | $ 984 |
Less than 1 year [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount |  | 1,250
Fair Value Asset |  | 10
6-7 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount |  | 13,261
Fair Value Liability |  | (73)
Fair Value Asset |  | $ 1,028

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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