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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, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Controlling interest:        
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes $ (1,952,414) $ (98) $ 883,408 $ (3,765,688)
Translation effect of foreign entities (11,515,297)   (35,536,252) (64,314,032)
Assets revaluation surplus net of deferred taxes 77,230,031      
Total other comprehensive (loss) income items for the year, net of deferred taxes 53,462,762 $ 2,678 (64,188,516) (67,322,442)
Total equity attributable to equity holders of the parent [member]        
Controlling interest:        
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes (1,952,414)   883,408 (3,765,688)
Translation effect of foreign entities (13,558,774)   (34,010,066) (61,223,458)
Remeasurement of defined benefit plan, net of deferred taxes (10,026,454)   (29,153,554) 652,722
Assets revaluation surplus net of deferred taxes 64,835,155      
Non-controlling interest of the items above 14,165,249   (1,908,304) (2,986,018)
Total other comprehensive (loss) income items for the year, net of deferred taxes $ 53,462,762   $ (64,188,516) $ (67,322,442)