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Components of other comprehensive loss (income) - Summary of Movement on Components of Other Comprehensive Loss (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Controlling interest:        
Unrealized gain (loss) on equity investments at fair value, net of deferred taxes $ 4,560,869 $ 222 $ (1,952,414) [1] $ 883,409 [1]
Translation effect of foreign entities (7,134,153)   (11,515,297) (35,536,252)
Asset's revaluation surplus net of deferred taxes     77,230,031  
Total equity attributable to equity holders of the parent [member]        
Controlling interest:        
Unrealized gain (loss) on equity investments at fair value, net of deferred taxes 4,560,869   (1,952,414) 883,409
Translation effect of foreign entities (4,837,206)   (13,558,774) (34,010,066)
Remeasurement of defined benefit plan, net of deferred taxes 11,100,835   (10,026,454) (29,153,554)
Asset's revaluation surplus net of deferred taxes     64,835,155  
Non-controlling interest of the items above (2,135,886)   14,165,249 (1,908,304)
Total other comprehensive (loss) income items for the year, net of deferred taxes 7,859,449   $ 53,462,762 $ (64,188,515)
Total equity attributable to equity holders of the parent [member] | Discontinued operations [member]        
Controlling interest:        
Translation effect of foreign entities $ (829,163)      
[1] Restated for discontinued operations.