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Components of Other Comprehensive (Loss) Income - Summary of Movement on Components of Other Comprehensive (Loss) Income (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Controlling interest:        
Available for sale securities, net of deferred taxes $ 622,424   $ (6,673,731) $ 4,011
Translation effect of foreign entities (18,309,877)   107,498,708 (35,606,320)
Total other comprehensive (loss) income items for the year, net of deferred taxes (24,721,250) $ (1,249) 115,647,505 (53,545,232)
Total equity attributable to equity holders of the parent [member]        
Controlling interest:        
Valuation of the derivative financial instruments, net of deferred taxes 12,292   48,496 37,011
Available for sale securities, net of deferred taxes 622,424   (6,673,731) 4,011
Translation effect of foreign entities (21,683,333)   104,178,880 (34,055,403)
Remeasurement of defined benefit plan, net of deferred taxes (7,075,606)   14,771,770 (17,791,354)
Non-controlling interest of the items above 3,402,973   3,322,090 (1,739,497)
Total other comprehensive (loss) income items for the year, net of deferred taxes $ (24,721,250)   $ 115,647,505 $ (53,545,232)