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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
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share [abstract]      
Weighted average number of shares outstanding 43,107,457 42,211,409 41,491,672
Capitalization of retained earnings 1,687,295 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 45,502,905 44,606,857 43,887,120
Effect of dilutive instruments - share-based compensation (note 21) 237,102 226,972 171,747
Effect of potentially dilutive instruments - optionally convertible securities (note 16.2) 2,698,600 3,834,458 5,065,605
Weighted average number of shares - diluted 48,438,607 48,668,287 49,124,472
Net income from continuing operations $ 13,139 $ 14,438 $ 1,096
Less: non-controlling interest net income 1,417 1,173 923
Controlling interest net income from continuing operations 11,722 13,265 173
Plus: after tax interest expense on mandatorily convertible securities 91 119 144
Controlling interest net income from continuing operations - for basic earnings per share calculations 11,813 13,384 317
Plus: after tax interest expense on optionally convertible securities 903 1,079 1,288
Controlling interest net income from continuing operations - for diluted earnings per share calculations 12,716 14,463 1,605
Net income from discontinued operations $ 3,499 $ 768 $ 1,028
Basic earnings per share      
Controlling interest basic earnings per share $ 0.34 $ 0.32 $ 0.03
Controlling interest basic earnings per share from continuing operations 0.26 0.30 0.01
Controlling interest basic earnings per share from discontinued operations 0.08 0.02 0.02
Controlling interest diluted earnings per share      
Controlling interest diluted earnings per share 0.34 0.32 0.03
Controlling interest diluted earnings per share from continuing operations 0.26 0.30 0.01
Controlling interest diluted earnings per share from discontinued operations $ 0.08 $ 0.02 $ 0.02