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Taxes - Net Deferred Income Tax Asset rollforward (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major components of tax expense (income) [abstract]      
Balance at the beginning of the period $ (13,575) $ (10,657) $ (9,720)
Deferred tax provision for the period (3,871) (1,176) (311)
Deferred tax income net recorded in share of the profit of equity accounted investees (404) (406) 165
Acquisition of subsidiaries   382 316
Unrealized (gain) on cash flow hedges 865 (391) (445)
Exchange differences on translation of foreign operations 2,215 (2,121) (1,762)
Remeasurements of the net defined benefit liability (256) (204) 543
Retained earnings of equity accounted investees (32) 384 54
Cash flow hedges in foreign investments (1,020) 425 310
Restatement effect of the period and beginning balances associated with hyperinflationary economies 68 953 438
Disposal of subsidiaries     387
Balance at the end of the period $ (16,010) $ (13,575) $ (10,657)