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Income taxes - Effective Consolidated Income Tax Rates (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Major components of tax expense (income) [abstract]
Income before income tax	$ 13,659	$ 17,563	$ 3,464
Income tax expense	$ (520)	$ (3,125)	$ (2,368)
Effective consolidated income tax rate	(3.80%)	(17.80%)	(68.40%)

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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