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Shareholders Equity - Summary of Computation of Basic and Diluted Earnings per Share (Detail)
$ / shares in Units, $ in Thousands, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
MXN ($)
$ / shares
shares
Dec. 31, 2018
MXN ($)
$ / shares
shares
Earnings per share [abstract]        
Net profit for the period attributable to equity holders of the parent $ 46,852,605 $ 2,349 $ 67,730,891 $ 52,566,197
Weighted average shares (in millions) | shares 66,265 66,265 66,016 66,055
Earnings per share attributable to equity holders of the parent | $ / shares $ 0.71   $ 1.03 $ 0.79