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Significant Accounting Policies - Foreign Currencies (Detail) $ in Millions | 12 Months Ended |
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Dec. 31, 2020 MXN ($) $ / € $ / $ € / $ $ / $ ₱ / $ S/ / $ C$ / $ Q / $ $ / $ ₡ / $ $ / $ $ / $ R$ / $ $ / $ | Dec. 31, 2019 MXN ($) $ / € $ / $ € / $ $ / $ ₱ / $ S/ / $ C$ / $ Q / $ $ / $ ₡ / $ $ / $ $ / $ R$ / $ $ / $ | Dec. 31, 2018 MXN ($) € / $ $ / $ ₱ / $ S/ / $ C$ / $ Q / $ $ / $ ₡ / $ $ / $ $ / $ R$ / $ $ / $ | Apr. 09, 2021 $ / € $ / $
Disclosure of significant accounting policies [line items] |  |  |  |
Goodwill recognised as of acquisition date | $ | $ 0 |  |  |
Interest income on loans and receivables | $ | $ 0 | $ 0 | $ 0 |
Exchange Rate as of | 19.8920 |  |  |
Impairment charge, intangibles | $ | $ 375 |  |  |
Guatemala, Quetzal [member] | Guatemala [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Quetzal |  |  |
Average Exchange Rate for | Q / $ | 2.78 | 2.50 | 2.56 |
Exchange Rate as of | Q / $ | 2.56 | 2.45 |  |
Costa Rica, Colon [member] | Costa Rica [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Colon |  |  |
Average Exchange Rate for | ₡ / $ | 0.04 | 0.03 | 0.03 |
Exchange Rate as of | ₡ / $ | 0.03 | 0.03 |  |
USD |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Exchange Rate as of | 19.9487 | 18.8452 |  | 20.1765
USD | Panama [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | U.S. dollar |  |  |
Average Exchange Rate for | 21.49 | 19.26 | 19.24 |
Exchange Rate as of | 19.95 | 18.85 |  |
USD | Ecuador [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | U.S. dollar |  |  |
Average Exchange Rate for | 21.49 | 19.26 | 19.24 |
Exchange Rate as of | 19.95 | 18.85 |  |
USD | United States [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | U.S. dollar |  |  |
Average Exchange Rate for | 21.49 |  |  |
Exchange Rate as of | 19.95 |  |  |
Colombian peso [member] | Colombia [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Colombian peso |  |  |
Average Exchange Rate for | 0.01 | 0.01 | 0.01 |
Exchange Rate as of | 0.01 | 0.01 |  |
Nicaragua, Cordoba [member] | Nicaragua [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Cordoba |  |  |
Average Exchange Rate for | C$ / $ | 0.63 | 0.58 | 0.62 |
Exchange Rate as of | C$ / $ | 0.57 | 0.56 |  |
Argentine peso [member] | Argentina [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Argentine peso |  |  |
Average Exchange Rate for | 0.31 | 0.41 | 0.73 |
Exchange Rate as of | 0.24 | 0.31 |  |
Brazilian reais [member] | Brazil [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Reais |  |  |
Average Exchange Rate for | R$ / $ | 4.18 | 4.89 | 5.29 |
Exchange Rate as of | R$ / $ | 3.84 | 4.68 |  |
Chilean peso [member] | Chile [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Chilean peso |  |  |
Average Exchange Rate for | 0.03 | 0.03 | 0.03 |
Exchange Rate as of | 0.03 | 0.03 |  |
Euro [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Exchange Rate as of | $ / € | 24.5213 | 21.1223 |  | 23.8326
Euro [member] | Euro Zone [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Euro (€) |  |  |
Average Exchange Rate for | € / $ | 24.48 | 21.56 | 22.71 |
Exchange Rate as of | € / $ | 24.52 | 21.12 |  |
Peru, Nuevo Sol [member] | Peru [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Nuevo Sol |  |  |
Average Exchange Rate for | S/ / $ | 6.15 | 5.77 | 5.85 |
Exchange Rate as of | S/ / $ | 5.51 | 5.68 |  |
Philippine peso [member] | Philippines [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Philippine peso |  |  |
Average Exchange Rate for | ₱ / $ | 0.00 | 0.00 | 0.37 |
Exchange Rate as of | ₱ / $ | 0.00 | 0.00 |  |
Uruguay Peso en Unidades Indexadas (UPUI) [member] | Uruguay [member] |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |
Functional / Recording Currency | Uruguayan peso |  |  |
Average Exchange Rate for | 0.51 | 0.55 | 0.63 |
Exchange Rate as of | 0.47 | 0.51 |  |

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