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Components of Other Comprehensive Loss - Summary of Movement on Components of Other Comprehensive Loss (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Controlling interest:        
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes $ 883,408 $ 47 $ (3,765,688) $ 622,424
Translation effect of foreign entities (35,536,252)   (64,314,032) (18,309,877)
Total other comprehensive loss items for the year, net of deferred taxes (64,188,516) $ (3,406) (67,322,442) (24,721,250)
Total equity attributable to equity holders of the parent [member]        
Controlling interest:        
Valuation of the derivative financial instruments, net of deferred taxes       12,292
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes 883,408   (3,765,688) 622,424
Translation effect of foreign entities (34,010,066)   (61,223,458) (21,683,333)
Remeasurement of defined benefit plan, net of deferred taxes (29,153,554)   652,722 (7,075,606)
Non-controlling interest of the items above (1,908,304)   (2,986,018) 3,402,973
Total other comprehensive loss items for the year, net of deferred taxes $ (64,188,516)   $ (67,322,442) $ (24,721,250)