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Income Taxes - Summary of Temporary Differences in Deferred Income Tax Assets and Liabilities (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax asset (liability) $ (3,333) $ (984)
Deferred tax assets:    
Tax loss carryforwards and other tax credits 13,796 15,900
Accounts payable and accrued expenses 6,638 7,083
Intangible assets and deferred charges, net 2,794 4,175
Total deferred tax assets, gross 23,228 27,158
Presentation offset regarding same legal entity (11,661) (12,341)
Total deferred tax assets, net in the statement of financial position 11,567 14,817
Deferred tax liabilities:    
Property, machinery and equipment (25,972) (27,268)
Investments and other assets (589) (874)
Total deferred tax liabilities, gross (26,561) (28,142)
Presentation offset regarding same legal entity 11,661 12,341
Total deferred tax liabilities, net in the statement of financial position (14,900) (15,801)
Net deferred tax liabilities (3,333) (984)
Country of domicile [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax asset (liability) (4,414) (3,978)
Deferred tax assets:    
Total deferred tax assets, net in the statement of financial position 3,079 3,212
Deferred tax liabilities:    
Total deferred tax liabilities, net in the statement of financial position (7,493) (7,190)
Net deferred tax liabilities (4,414) (3,978)
Foreign countries [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax asset (liability) 1,081 2,994
Deferred tax assets:    
Total deferred tax assets, net in the statement of financial position 8,488 11,605
Deferred tax liabilities:    
Total deferred tax liabilities, net in the statement of financial position (7,407) (8,611)
Net deferred tax liabilities $ 1,081 $ 2,994