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Shareholders Equity - Summary of Computation of Basic and Diluted Earnings per Share (Detail) $ / shares in Units, $ in Thousands, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 MXN ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 MXN ($) $ / shares shares	Dec. 31, 2015 MXN ($) $ / shares shares
Earnings per share [abstract]
Net profit for the period attributable to equity holders of the parent	$ 29,325,921	$ 1,482	$ 8,649,427	$ 35,054,772
Weighted average shares (in millions) | shares	65,909	65,909	65,693	66,869
Earnings per share attributable to equity holders of the parent | $ / shares	$ 0.44		$ 0.13	$ 0.52

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

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- Definition

The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)]

+ References

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

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