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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, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Controlling interest:        
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes $ (3,765,688) $ (191) $ 622,424 $ (6,673,731)
Translation effect of foreign entities (64,314,032)   (18,309,877) 107,498,708
Total other comprehensive (loss) income items for the year, net of deferred taxes (67,322,442) $ (3,421) (24,721,250) 115,647,505
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
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes (3,765,688)   622,424 (6,673,731)
Translation effect of foreign entities (61,223,458)   (21,683,333) 104,178,880
Remeasurement of defined benefit plan, net of deferred taxes 652,722   (7,075,606) 14,771,770
Non-controlling interest of the items above (2,986,018)   3,402,973 3,322,090
Total other comprehensive (loss) income items for the year, net of deferred taxes $ (67,322,442)   $ (24,721,250) $ 115,647,505