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Income Taxes - Summary of Temporary Differences in Deferred Income Tax Assets and Liabilities (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Tax loss carryforwards and other tax credits $ 15,900 $ 17,514
Accounts payable and accrued expenses 7,083 9,262
Intangible assets and deferred charges, net 4,175 6,358
Others 0 411
Total deferred tax assets, net 27,158 33,545
Deferred tax liabilities:    
Property, machinery and equipment (27,268) (35,095)
Investments and other assets (874) (2,012)
Total deferred tax liabilities, net (28,142) (37,107)
Net deferred tax liabilities (984) (3,562)
Country of domicile [member]    
Deferred tax liabilities:    
Net deferred tax liabilities (3,644) (2,509)
Foreign countries [member]    
Deferred tax liabilities:    
Net deferred tax liabilities $ 2,660 $ (1,053)