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Income Taxes - Schedule of Tax Loss Carryforwards (Detail)
$ in Millions
Dec. 31, 2018
MXN ($)
Major components of tax expense (income) [abstract]  
2019 $ 716
2020 301
2021 338
2022 370
2023 288
2024 744
2025 4,029
2026 4,483
2027 728
2028 and thereafter 3,023
No expiration (Brazil and Colombia) 14,921
Tax Loss Carryforwards $ 29,941