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Earnings per Share (Detail)
$ / shares in Units, shares in Thousands, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
MXN ($)
$ / shares
shares
Dec. 31, 2019
MXN ($)
$ / shares
shares
Dec. 31, 2018
MXN ($)
$ / shares
shares
Earnings per share [line items]        
Net controlling interest income allocated from continuing operations $ (98) $ (1,930) $ 20,699 $ 22,560
Net controlling interest income allocated from discontinued operations | $       $ 1,430
Series B shares [member]        
Earnings per share [line items]        
Weighted average number of shares for basic earnings per share | shares 9,243,590 9,243,590 9,244,160 9,243,810
Effect of dilution associated with non-vested shares for share based payment plans | shares 2,830 2,830 2,260 2,610
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) | shares 9,246,420 9,246,420 9,246,420 9,246,420
Dividend rights per series (see Note 22.1) 100.00% 100.00% 100.00% 100.00%
Weighted average number of shares further adjusted to reflect dividend rights | shares 9,246,420 9,246,420 9,246,420 9,246,420
Basic earnings per share from continuing operations | $ / shares   $ (0.10) $ 1.03 $ 1.13
Basic earnings per share from discontinued operations | $ / shares       0.07
Diluted earnings per share from continuing operations | $ / shares   $ (0.10) $ 1.03 1.13
Diluted earnings per share from discontinued operations | $ / shares       $ 0.07
Allocation of earnings, weighted 46.11% 46.11% 46.11% 46.11%
Net controlling interest income allocated from continuing operations | $   $ (890) $ 9,545 $ 10,403
Net controlling interest income allocated from discontinued operations | $       $ 660
Series D shares [member]        
Earnings per share [line items]        
Weighted average number of shares for basic earnings per share | shares 8,633,380 8,633,380 8,635,650 8,634,260
Effect of dilution associated with non-vested shares for share based payment plans | shares 11,330 11,330 9,060 10,450
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) | shares 8,644,710 8,644,710 8,644,710 8,644,710
Dividend rights per series (see Note 22.1) 125.00% 125.00% 125.00% 125.00%
Weighted average number of shares further adjusted to reflect dividend rights | shares 10,805,890 10,805,890 10,805,890 10,805,890
Basic earnings per share from continuing operations | $ / shares   $ (0.12) $ 1.29 $ 1.41
Basic earnings per share from discontinued operations | $ / shares       0.09
Diluted earnings per share from continuing operations | $ / shares   $ (0.12) $ 1.29 1.41
Diluted earnings per share from discontinued operations | $ / shares       $ 0.09
Allocation of earnings, weighted 53.89% 53.89% 53.89% 53.89%
Net controlling interest income allocated from continuing operations | $   $ (1,040) $ 11,154 $ 12,157
Net controlling interest income allocated from discontinued operations | $       $ 770