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Taxes - Net Deferred Income Tax Asset rollforward (Detail) - MXN ($) $ in Millions | 12 Months Ended
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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)

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