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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | $ 9,928 |  |
Balance at end of the period | 8,854 | $ 9,928 |
Indirect taxes [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | 5,421 | 6,836 | $ 11,065
Penalties and other charges | 1 | 123 | 362
New contingencies | 486 | 178 | 91
Contingencies added in business combination |  | 104 | 861
Cancellation and expiration | (247) | 106 | (796)
Payments | (174) | (112) | (947)
Brazil amnesty adoption |  |  | (3,321)
Effects of changes in foreign exchange rates | (425) | (951) | (479)
Effects due to derecognition of Philippines |  | (863) |
Balance at end of the period | 5,062 | 5,421 | 6,836
Labor [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | 2,601 | 2,723 | 2,578
Penalties and other charges | 293 | 310 | 56
New contingencies | 521 | 330 | 283
Contingencies added in business combination | 44 | 289 |
Cancellation and expiration | (283) | (133) | (32)
Payments | (500) | (193) | (92)
Effects of changes in foreign exchange rates | (221) | (725) | (69)
Venezuela deconsolidation effect |  |  | (1)
Balance at end of the period | 2,455 | 2,601 | 2,723
Legal [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the period | 1,906 | 3,296 | 2,785
Penalties and other charges | 94 | 86 | 121
New contingencies | 213 | 72 | 186
Contingencies added in business combination | 77 | 67 | 783
Cancellation and expiration | (542) | (146) | (16)
Payments | (318) | (251) | (417)
Brazil amnesty adoption |  |  | 7
Effects of changes in foreign exchange rates | (93) | (335) | (151)
Venezuela deconsolidation effect |  |  | (2)
Effects due to derecognition of Philippines |  | (883) |
Balance at end of the period | $ 1,337 | $ 1,906 | $ 3,296

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