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Income Taxes - Summary of Tax Loss and Tax Credits (Detail)
$ in Millions
Dec. 31, 2017
MXN ($)
Tax Loss Carry Forwards [Member]  
Disclosure of Income Taxes [Line Items]  
2018 $ 1,099
2019 5,989
2020 8,929
2021 4,407
2022 and thereafter 288,466
Tax Loss And Tax Credits, Total 308,890
Amount of unrecognized carryforwards [Member]  
Disclosure of Income Taxes [Line Items]  
2018 415
2019 5,149
2020 8,115
2021 2,908
2022 and thereafter 230,425
Tax Loss And Tax Credits, Total 247,012
Amount of recognized carryforwards [Member]  
Disclosure of Income Taxes [Line Items]  
2018 684
2019 840
2020 814
2021 1,499
2022 and thereafter 58,041
Tax Loss And Tax Credits, Total $ 61,878