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Pensions and Post-Employment Benefits - Aggregate Projected Benefit Obligation for Pension Plans and Other Post-employment Benefits and the Plan Assets by Country (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
PBO | $ 56,346 | $ 52,219 | $ 43,840
Assets | 32,693 | 28,854 | $ 25,571
Deficit | 23,653 | 23,365 |
Mexico [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 3,213 | 3,247 |
Assets | 840 | 824 |
Deficit | 2,373 | 2,423 |
United States [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 6,378 | 7,110 |
Assets | 4,031 | 4,192 |
Deficit | 2,347 | 2,918 |
United Kingdom [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 35,602 | 33,925 |
Assets | 23,145 | 22,154 |
Deficit | 12,457 | 11,771 |
Germany [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 4,362 | 4,429 |
Assets | 213 | 227 |
Deficit | 4,149 | 4,202 |
Other countries [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 6,791 | 3,508 |
Assets | 4,464 | 1,457 |
Deficit | $ 2,327 | $ 2,051 |

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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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 fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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