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Income Taxes - Summary of Major Components of Income Tax Expense (Detail) $ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 MXN ($)	Sep. 30, 2018 MXN ($)
Major Components Of Tax Expense Income [line items]
Current tax expense		$ 4,448	$ 3,536
Deferred tax expense:		(495)	237
Total income tax expense in consolidated net income	$ 200	$ 3,953	$ 3,773

- Definition

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

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