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Other Liabilities, Provisions and Commitments - Summary of Changes in Balance of Provisions Recorded (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of other provisions [line items] |  |  |  |
Balance at beginning of the period | $ 7,983 |  |  |
Balance at end of the period | 5,100 |  | $ 7,983 |
Taxes |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Balance at beginning of the period | 4,696 |  | 5,038 | $ 6,717
Penalties and other charges | 0 |  | 1 | 7
New contingencies | 186 |  | 368 | 178
Cancellation and adjustments | (152) |  | (247) | (44)
Contingencies added in business combinations | 0 |  | 0 | 104
Payments | (187) |  | (68) | (110)
Reversal of indemnifiable items |  | $ (1,177) |  |
Effect of foreign currency exchange rates | (826) |  | (396) | (951)
Philippines disposal | 0 |  | 0 | (863)
Balance at end of the period | 2,540 |  | 4,696 | 5,038
Labor |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Balance at beginning of the period | 2,222 |  | 2,340 | 2,365
Penalties and other charges | 228 |  | 249 | 279
New contingencies | 227 |  | 465 | 205
Cancellation and adjustments | (51) |  | (273) | (109)
Contingencies added in business combinations | 0 |  | 44 | 289
Payments | (561) |  | (401) | (20)
Effect of foreign currency exchange rates | (384) |  | (202) | (669)
Balance at end of the period | 1,681 |  | 2,222 | 2,340
Legal |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Balance at beginning of the period | 1,065 |  | 920 | 1,985
Penalties and other charges | 8 |  | 94 | 86
New contingencies | 193 |  | 128 | 61
Cancellation and adjustments | (141) |  | (45) | (9)
Contingencies added in business combinations | 0 |  | 77 | 67
Payments | (111) |  | (44) | (251)
Effect of foreign currency exchange rates | (135) |  | (65) | (135)
Philippines disposal | 0 |  | 0 | (884)
Balance at end of the period | $ 879 |  | $ 1,065 | $ 920

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