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Other Liabilities, Provisions, Contingencies and Commitments - Changes in Balance of Provisions Recorded (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | $ 8,854 |  |
Reversal of indemnifiable items | (1,177) |  |
Balance at end of the period | 6,303 | $ 8,854 |
Spaipa SA Industria Brasileira de Bebidas [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Reversal of indemnifiable items | (899) |  |
Indirect taxes [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | 5,062 | 5,421 | $ 6,836
Penalties and other charges |  | 1 | 123
New contingencies | 489 | 486 | 178
Contingencies added in business combination |  |  | 104
Cancellation and expiration | (153) | (247) | 106
Payments | (218) | (174) | (112)
Effects of changes in foreign exchange rates | (850) | (425) | (951)
Effects due to derecognition of Philippines |  |  | (863)
Balance at end of the period | 3,153 | 5,062 | 5,421
Labor [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | 2,455 | 2,601 | 2,723
Penalties and other charges | 233 | 293 | 310
New contingencies | 249 | 521 | 330
Contingencies added in business combination |  | 44 | 289
Cancellation and expiration | (61) | (283) | (133)
Payments | (592) | (500) | (193)
Effects of changes in foreign exchange rates | (427) | (221) | (725)
Balance at end of the period | 1,857 | 2,455 | 2,601
Legal [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | 1,337 | 1,906 | 3,296
Penalties and other charges | 8 | 94 | 86
New contingencies | 362 | 213 | 72
Contingencies added in business combination |  | 77 | 67
Cancellation and expiration | (141) | (542) | (146)
Payments | (111) | (318) | (251)
Effects of changes in foreign exchange rates | (162) | (93) | (335)
Effects due to derecognition of Philippines |  |  | (883)
Balance at end of the period | $ 1,293 | $ 1,337 | $ 1,906

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