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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the year | $ 16,428 |  |
Balance at end of the year | 12,855 | $ 16,428 |
Indirect taxes [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the year | 11,065 | 1,725 | $ 2,271
Penalties and other charges | 362 | 173 | 21
New contingencies | 91 | 768 | 84
Contingencies added in business combination | 861 | 7,840 |
Cancellation and expiration | (796) | (106) | (205)
Payments | (947) | (6) | (214)
Brazil amnesty adoption | (3,321) |  |
Effects of changes in foreign exchange rates | (479) | 671 | (232)
Balance at end of the year | 6,836 | 11,065 | 1,725
Labor [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the year | 2,578 | 1,372 | 1,587
Penalties and other charges | 56 | 203 | 210
New contingencies | 283 | 397 | 44
Contingencies added in business combination |  | 500 |
Cancellation and expiration | (32) | (186) | (102)
Payments | (92) | (336) | (114)
Effects of changes in foreign exchange rates | (69) | 628 | (253)
Venezuela deconsolidation effect | (1) |  |
Balance at end of the year | 2,723 | 2,578 | 1,372
Legal [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Balance at beginning of the year | 2,785 | 318 | 427
Penalties and other charges | 121 | 34 |
New contingencies | 186 | 196 |
Contingencies added in business combination | 783 | 2,231 |
Cancellation and expiration | (16) | (46) | (33)
Payments | (417) | (81) |
Brazil amnesty adoption | 7 |  |
Effects of changes in foreign exchange rates | (151) | 133 | (76)
Venezuela deconsolidation effect | (2) |  |
Balance at end of the year | $ 3,296 | $ 2,785 | $ 318

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