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Financial Instruments - Disclosure of Net Effects of Expired Contracts Met Hedging Criteria (Detail) - Derivative contracts that met hedging criteria [Member] - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cross-currency swaps [member] | Interest expense [member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects derivative contracts hedging criteria | $ 157 | $ 2,102 |
Cross-currency swaps [member] | Foreign exchange [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects derivative contracts hedging criteria | 642 |  |
Forward agreements to purchase foreign currency [member] | Foreign exchange [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects derivative contracts hedging criteria | (87) | (40) | $ 160
Forward agreements to purchase foreign currency [member] | Cost of sales [member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects derivative contracts hedging criteria | 240 | 89 | (45)
Commodity price contracts [Member] | Cost of sales [member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects derivative contracts hedging criteria | (258) | $ (6) | $ (241)
Options to purchase foreign currency [Member] | Cost of sales [member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects derivative contracts hedging criteria | $ (8) |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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