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Income Taxes - Summary of Tax Loss and Tax Credits (Detail) $ in Millions | Dec. 31, 2018 MXN ($)
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Tax Loss Carry Forwards [Member] |
Disclosure of Income Taxes [Line Items] |
2019 | $ 1,809
2020 | 8,749
2021 | 3,984
2022 | 6,576
2023 and thereafter | 276,089
Tax Loss And Tax Credits, Total | 297,207
Amount of unrecognized carryforwards [Member] |
Disclosure of Income Taxes [Line Items] |
2019 | 1,636
2020 | 8,483
2021 | 3,170
2022 | 6,389
2023 and thereafter | 222,179
Tax Loss And Tax Credits, Total | 241,857
Amount of recognized carryforwards [Member] |
Disclosure of Income Taxes [Line Items] |
2019 | 173
2020 | 266
2021 | 814
2022 | 187
2023 and thereafter | 53,910
Tax Loss And Tax Credits, Total | $ 55,350

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