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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, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Current tax expense: |  |  |  |
Current year | $ 4,763 |  | $ 6,108 | $ 8,574
Deferred tax expense: |  |  |  |
Origination and reversal of temporary differences | 1,579 |  | (1,859) | (2,812)
(Benefit) utilization of tax losses recognized | (1,082) |  | (65) | (1,834)
Total deferred tax (benefit) | 497 |  | (1,924) | (4,646)
Total income tax expense in consolidated net income | 5,260 | $ 268 | 4,184 | 3,928
Mexico [member] |  |  |  |
Current tax expense: |  |  |  |
Current year | 3,545 |  | 3,874 | 4,035
Deferred tax expense: |  |  |  |
Origination and reversal of temporary differences | (283) |  | (1,798) | (1,117)
(Benefit) utilization of tax losses recognized | (679) |  | 179 | (1,285)
Total deferred tax (benefit) | (962) |  | (1,619) | (2,402)
Total income tax expense in consolidated net income | 2,583 |  | 2,255 | 1,633
Foreign [member] |  |  |  |
Current tax expense: |  |  |  |
Current year | 1,218 |  | 2,234 | 4,539
Deferred tax expense: |  |  |  |
Origination and reversal of temporary differences | 1,862 |  | (61) | (1,695)
(Benefit) utilization of tax losses recognized | (403) |  | (244) | (549)
Total deferred tax (benefit) | 1,459 |  | (305) | (2,244)
Total income tax expense in consolidated net income | $ 2,677 |  | $ 1,929 | $ 2,295

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