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Income Taxes - Summary of Major Components of Income Tax Expense (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Current tax expense: |  |  |  |  |
Current year |  | $ 7,367 | $ 6,011 |  | $ 4,763
Deferred tax expense: |  |  |  |  |
Origination and reversal of temporary differences |  | (3,391) | 905 |  | 1,579
Utilization (benefit) of tax losses recognized |  | 1,452 | (1,268) |  | (1,082)
Total deferred tax income expense (benefit) |  | (1,939) | (363) |  | 497
Total income tax expense in consolidated net income | $ 273 | 5,428 | 5,648 | [2] | 5,260
Mexico |  |  |  |  |
Current tax expense: |  |  |  |  |
Current year |  | 6,311 | 5,123 |  | 3,545
Deferred tax expense: |  |  |  |  |
Origination and reversal of temporary differences |  | (2,676) | (438) |  | (283)
Utilization (benefit) of tax losses recognized |  | 1,962 | (1,136) |  | (679)
Total deferred tax income expense (benefit) |  | (714) | (1,574) |  | (962)
Total income tax expense in consolidated net income |  | 5,597 | 3,549 |  | 2,583
Foreign |  |  |  |  |
Current tax expense: |  |  |  |  |
Current year |  | 1,056 | 888 |  | 1,218
Deferred tax expense: |  |  |  |  |
Origination and reversal of temporary differences |  | (715) | 1,343 |  | 1,862
Utilization (benefit) of tax losses recognized |  | (510) | (132) |  | (403)
Total deferred tax income expense (benefit) |  | (1,225) | 1,211 |  | 1,459
Total income tax expense in consolidated net income |  | $ (169) | $ 2,099 |  | $ 2,677
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated – See note 3.18

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