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Pensions and Post-Employment Benefits - Schedule of Reconciliations of the Actuarial Benefits Obligations, Pension Plan Assets, And Liabilities Recognized in the Balance Sheet (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of defined benefit plans [line items] |  |  |
Projected benefit obligation at beginning of the period | $ 52,219 | $ 43,840 |
Service cost | 254 | 176 | $ 158
Interest cost | 1,701 | 1,744 |
Actuarial (gains) losses | 703 | 6,298 |
Additions through business combinations | 3,072 | 0 |
Settlements and curtailments | 0 | (19) |
Plan amendments | 15 | 8 |
Benefits paid | (3,001) | (2,453) |
Foreign currency translation | 1,383 | 2,625 |
Projected benefit obligation at end of the period | 56,346 | 52,219 | 43,840
Fair value of plan assets at beginning of the period | 28,854 | 25,571 |
Return on plan assets | 934 | 976 |
Actuarial (gains) losses for the period | 706 | 2,279 |
Employer contributions | 1,575 | 1,382 |
Additions through business combinations | 2,841 | 0 |
Reduction for disposal of assets | (4) | 0 |
Settlements and curtailments | 0 | (19) |
Benefits paid | (3,001) | (2,453) |
Foreign currency translation | 788 | 1,118 |
Fair value of plan assets at end of the period | 32,693 | 28,854 | 25,571
Net projected liability recognized in the statement of financial position | 23,653 | 23,365 |
Pensions [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Projected benefit obligation at beginning of the period | 51,055 | 42,740 |
Service cost | 221 | 151 | 128
Interest cost | 1,625 | 1,685 |
Actuarial (gains) losses | 727 | 6,263 |
Additions through business combinations | 2,801 | 0 |
Settlements and curtailments | 0 | 0 |
Plan amendments | 15 | 8 |
Benefits paid | (2,920) | (2,379) |
Foreign currency translation | 1,386 | 2,587 |
Projected benefit obligation at end of the period | 54,910 | 51,055 | 42,740
Fair value of plan assets at beginning of the period | 28,828 | 25,547 |
Return on plan assets | 932 | 974 |
Actuarial (gains) losses for the period | 707 | 2,278 |
Employer contributions | 1,494 | 1,289 |
Additions through business combinations | 2,841 | 0 |
Reduction for disposal of assets | (4) | 0 |
Settlements and curtailments | 0 | 0 |
Benefits paid | (2,920) | (2,379) |
Foreign currency translation | 787 | 1,119 |
Fair value of plan assets at end of the period | 32,665 | 28,828 | 25,547
Net projected liability recognized in the statement of financial position | 22,245 | 22,227 |
Other Benefits Plans [Member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Projected benefit obligation at beginning of the period | 1,164 | 1,100 |
Service cost | 33 | 25 | 30
Interest cost | 76 | 59 |
Actuarial (gains) losses | (24) | 35 |
Additions through business combinations | 271 | 0 |
Settlements and curtailments | 0 | (19) |
Plan amendments | 0 | 0 |
Benefits paid | (81) | (74) |
Foreign currency translation | (3) | 38 |
Projected benefit obligation at end of the period | 1,436 | 1,164 | 1,100
Fair value of plan assets at beginning of the period | 26 | 24 |
Return on plan assets | 2 | 2 |
Actuarial (gains) losses for the period | (1) | 1 |
Employer contributions | 81 | 93 |
Additions through business combinations | 0 | 0 |
Reduction for disposal of assets | 0 | 0 |
Settlements and curtailments | 0 | (19) |
Benefits paid | (81) | (74) |
Foreign currency translation | 1 | (1) |
Fair value of plan assets at end of the period | 28 | 26 | $ 24
Net projected liability recognized in the statement of financial position | $ 1,408 | $ 1,138 |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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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 The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + 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 decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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