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Financial Instruments - Summary of Cash Flow Financial Instruments Amounts and Its Related Non-effective Portion (Detail) Unit_pure in Millions, Age in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) Age
Net sales trade receivables and borrowings [member] | Foreign exchange currency risk [member] |
Disclosure of detailed information about hedging instruments [line items] |
Notional | Age | 0
Assets | $ 0
Liabilities | $ 0
Financial position category in which the cash flow hedge is included | Other investments including financialderivatives (assets), trade accountspayable (liabilities)
Purchase of stock [member] | Foreign exchange currency risk [member] |
Disclosure of detailed information about hedging instruments [line items] |
Notional | 4,768
Assets | $ 109
Liabilities | $ (66)
Exchange rate swaps [member] | Foreign exchange currency risk [member] |
Disclosure of detailed information about hedging instruments [line items] |
Notional | 41,195
Assets | $ 2,390
Liabilities | $ (511)
Swap interest rate [member] | Interest rate risk [member] |
Disclosure of detailed information about hedging instruments [line items] |
Notional | 12,607
Assets | $ 0
Liabilities | $ (271)
Financial position category in which the cash flow hedge is included | Other investments including financialderivatives (assets), trade accountspayable (liabilities)
Aluminum price contracts [member] | Commodity price risk [member] |
Disclosure of detailed information about hedging instruments [line items] |
Notional | 265
Assets | $ 0
Liabilities | $ (17)
Sugar price contracts [member] | Commodity price risk [member] |
Disclosure of detailed information about hedging instruments [line items] |
Notional | 1,223
Assets | $ 0
Liabilities | $ (88)
PX MEG price [member] | Commodity price risk [member] |
Disclosure of detailed information about hedging instruments [line items] |
Notional | 1,303
Assets | $ 0
Liabilities | $ (131)

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- Definition The description of the line item in the statement of financial position that includes the hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_b&doctype=Standard -URIDate 2019-03-27 + Details
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Period Type: | duration

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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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Period Type: | duration

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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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