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Shareholders Equity - Summary of Computation of Basic and Diluted Earnings per Share (Detail)
$ / shares in Units, $ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
MXN ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
MXN ($)
$ / shares
shares
Dec. 31, 2019
MXN ($)
$ / shares
shares
Earnings per share [abstract]        
Net profit for the period attributable to equity holders of the parent from continuing operations $ 70,712,449 $ 3,435 $ 29,859,980 [1] $ 57,886,001 [1]
Net profit for the period attributable to equity holders of the parent from discontinued operations 121,710,718 $ 5,913 16,992,625 [1] 9,844,889 [1]
Net profit for the period attributable to equity holders of the parent | $ $ 192,423,167   $ 46,852,605 $ 67,730,890
Weighted average shares (in millions) | shares 65,967 65,967 66,265 66,016
Earnings per share attributable to equity holders of the parent continuing operations $ 1.07   $ 0.45 $ 0.88
Earnings per share attributable to equity holders of the parent discontinued operations $ 1.85   $ 0.26 $ 0.15
[1] Restated for discontinued operations.