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Shareholders Equity - Summary of Computation of Basic and Diluted Earnings per Share (Detail)
$ / shares in Units, $ / shares in Units, $ in Thousands, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
MXN ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
MXN ($)
$ / shares
shares
Dec. 31, 2021
MXN ($)
$ / shares
shares
Earnings per share [abstract]        
Net profit for the period attributable to equity holders of the parent from continuing operations $ 76,110,617 $ 4,505 $ 82,878,406 $ 68,187,225
Net profit for the period attributable to equity holders of the parent from discontinued operations 0   (6,719,015) 124,235,942
Net profit for the period attributable to equity holders of the parent $ 76,110,617   $ 76,159,391 $ 192,423,167
Weighted average shares (in millions) | shares 63,049 63,049 63,936 65,967
Earnings per share attributable to equity holders of the parent continuing operations | (per share) $ 1.21 $ 0.07 $ 1.3 $ 1.03
Earnings per share attributable to equity holders of the parent discontinued operations | $ / shares $ 0   $ (0.11) $ 1.88