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Earnings per Share - Summary of Calculations of Earnings per Share (Detail) - MXN ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings per share [abstract] |  |  |
Weighted-average number of shares outstanding | 45,569,180 | 43,107,457 | 42,211,409
Capitalization of retained earnings | 0 | 1,687,295 | 1,687,295
Effect of dilutive instruments - mandatorily convertible securities (note 16.2) | 708,153 | 708,153 | 708,153
Weighted-average number of shares - basic | 46,277,333 | 45,502,905 | 44,606,857
Effect of dilutive instruments - share-based compensation (note 21) | 316,970 | 237,102 | 226,972
Effect of potentially dilutive instruments - optionally convertible securities (note 16.2) | 1,420,437 | 2,698,600 | 3,834,458
Weighted-average number of shares - diluted | 48,014,740 | 48,438,607 | 48,668,287
Net income from continuing operations | $ 11,044 | $ 13,180 | $ 14,491
Less: non-controlling interest net income | 789 | 1,417 | 1,173
Controlling interest net income from continuing operations | 10,255 | 11,763 | 13,318
Plus: after tax interest expense on mandatorily convertible securities | 61 | 91 | 119
Controlling interest net income from continuing operations - for basic earnings per share calculations | 10,316 | 11,854 | 13,437
Plus: after tax interest expense on optionally convertible securities | 436 | 903 | 1,079
Controlling interest net income from continuing operations - for diluted earnings per share calculations | 10,752 | 12,757 | 14,516
Net income from discontinued operations | $ 212 | $ 3,461 | $ 713
Basic earnings per share |  |  |
Controlling interest basic earnings per share | $ 0.22 | $ 0.34 | $ 0.32
Controlling interest basic earnings per share from continuing operations | 0.22 | 0.26 | 0.30
Controlling interest basic earnings per share from discontinued operations | 0.00 | 0.08 | 0.02
Diluted earnings per share |  |  |
Controlling interest diluted earnings per share | 0.22 | 0.34 | 0.32
Controlling interest diluted earnings per share from continuing operations | 0.22 | 0.26 | 0.30
Controlling interest diluted earnings per share from discontinued operations | $ 0.00 | $ 0.08 | $ 0.02

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