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Income Taxes - Schedule of Tax Loss Carryforwards (Detail)
$ in Millions
Dec. 31, 2017
MXN ($)
Major components of tax expense (income) [abstract]  
2018 $ 665
2019 98
2020 111
2021 116
2022 122
2023 479
2024 86
2025 410
2026 and thereafter 10,681
No expiration (Brazil and Colombia) 16,719
Tax Loss Carryforwards $ 29,487