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Earnings per Share - Summary of Calculation of Basic and Diluted Earnings Per Share Amounts (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Series B shares [member] |  |  |
Earnings per share [line items] |  |  |
Weighted average number of shares for basic earnings per share | 9,243.14 | 9,242.48 | 9,241.91
Effect of dilution associated with non-vested shares for share based payment plans | 3.29 | 3.94 | 4.51
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) | 9,246.42 | 9,246.42 | 9,246.42
Dividend rights per series (see Note 22.1) | 100.00% | 100.00% | 100.00%
Weighted average number of shares further adjusted to reflect dividend rights | 9,246.42 | 9,246.42 | 9,246.42
Allocation of earnings, weighted | 46.11% | 46.11% | 46.11%
Net Controlling Interest Income Allocated | $ 19,555 | $ 9,748 | $ 8,154
Series D shares [member] |  |  |
Earnings per share [line items] |  |  |
Weighted average number of shares for basic earnings per share | 8,631.57 | 8,628.97 | 8,626.69
Effect of dilution associated with non-vested shares for share based payment plans | 13.14 | 15.74 | 18.02
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) | 8,644.71 | 8,644.71 | 8,644.71
Dividend rights per series (see Note 22.1) | 125.00% | 125.00% | 125.00%
Weighted average number of shares further adjusted to reflect dividend rights | 10,805.89 | 10,805.89 | 10,805.89
Allocation of earnings, weighted | 53.89% | 53.89% | 53.89%
Net Controlling Interest Income Allocated | $ 22,853 | $ 11,392 | $ 9,529

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