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Goodwill and Intangible Assets, Net - Summary of Changes in Consolidated goodwill (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of reconciliation of changes in goodwill [abstract]
Balance at beginning of period	$ 206,319	$ 184,156	$ 160,544
Business combinations	1,965	0	64
Disposals, net (note 4.3)	0	(3,340)	(552)
Reclassification to assets held for sale and other current assets (notes 4.2, 4.3 and 12)	(1,804)	(9,734)	0
Impairment losses	(1,920)	0	0
Foreign currency translation effects	(9,086)	35,237	24,100
Balance at end of period	$ 195,474	$ 206,319	$ 184,156

X

- Definition

The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

+ References

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- Definition

The decrease in goodwill due to classification as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

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- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

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- Definition

The amount of goodwill derecognised without having previously been included in a disposal group classified as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

+ References

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- Definition

The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

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