XML 200 R154.htm IDEA: XBRL DOCUMENT v3.19.1
Income Taxes - Summary of Tax Loss and Tax Credits (Detail)
$ in Millions
Dec. 31, 2018
MXN ($)
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