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Components of other comprehensive income (loss) - Summary of Movement on Components of Other Comprehensive Loss (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
MXN ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Controlling interest:        
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes $ (4,707,276) $ (242) $ 4,560,869 [1] $ (1,952,414) [1]
Translation effect of foreign entities (35,114,722)   (7,134,153) (11,515,297)
Asset's revaluation surplus net of deferred taxes       77,230,031
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 (4,707,276)   4,560,869 (1,952,414)
Translation effect of foreign entities (31,086,965)   (4,837,206) (13,558,774)
Remeasurement of defined benefit plan, net of deferred taxes (4,599,407)   11,100,835 (10,026,454)
Asset's revaluation surplus net of deferred taxes       64,835,155
Non-controlling interest of the items above (3,734,066)   (2,135,886) 14,165,249
Total other comprehensive (loss) income items for the year, net of deferred taxes (38,934,433)   7,859,449 $ 53,462,762
Total equity attributable to equity holders of the parent [member] | Discontinued operations [member]        
Controlling interest:        
Translation effect of foreign entities $ 5,193,281   $ (829,163)  
[1] Restated for discontinued operations