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Other Current and Non-current Liabilities - Summary of Other Non-current Liabilities (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract]    
Asset retirement obligations $ 7,906 $ 8,237
Accruals for legal assessments and other responsibilities 1,599 1,514
Non-current liabilities for valuation of derivative instruments 402 818
Environmental liabilities 991 1,172
Other non-current liabilities and provisions 4,751 5,305
Other non-current liabilities $ 15,649 $ 17,046