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Information by Segment - Summary of Segment Disclosure for Company's Consolidated Operations Narrative (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |  |
Total revenues | $ 194,804 | $ 183,615 | $ 194,471
Total assets | 271,567 | 263,066 | 257,839
Total liabilities | 143,995 | 140,609 | 128,154
Mexico and Central America Segment |  |  |
Disclosure of operating segments [line items] |  |  |
Total assets | 170,543 | 165,887 | 147,374
Total liabilities | 115,738 | 113,727 | 95,694
South America Segment |  |  |
Disclosure of operating segments [line items] |  |  |
Total assets | 101,024 | 97,179 | 110,465
Total liabilities | 28,257 | 26,882 | 32,460
Mexico | Mexico and Central America Segment |  |  |
Disclosure of operating segments [line items] |  |  |
Total revenues | 94,762 | 87,833 | 91,358
Total assets | 149,421 | 148,068 | 130,045
Total liabilities | 109,945 | 109,086 | 91,427
Brazil | South America Segment |  |  |
Disclosure of operating segments [line items] |  |  |
Total revenues | 53,051 | 56,191 | 61,554
Total assets | 74,163 | 70,376 | 82,667
Total liabilities | 20,440 | 19,148 | 24,103
Colombia | South America Segment |  |  |
Disclosure of operating segments [line items] |  |  |
Total revenues | 14,180 | 12,049 | 13,522
Total assets | 15,132 | 15,993 | 16,518
Total liabilities | 3,395 | 3,262 | 4,154
Argentina | South America Segment |  |  |
Disclosure of operating segments [line items] |  |  |
Total revenues | 8,408 | 5,468 | 6,725
Total assets | 6,087 | 5,039 | 5,341
Total liabilities | 2,013 | 1,842 | 1,637
Uruguay | South America Segment |  |  |
Disclosure of operating segments [line items] |  |  |
Total revenues | 3,371 | 3,124 | 3,421
Total assets | 5,642 | 5,771 | 5,939
Total liabilities | $ 2,409 | $ 2,630 | $ 2,566

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