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Equity and debt investments at fair value through OCI and other short/long-term investments - Additional Information (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Dividends received $ 2,628,600 $ 2,122,826 $ 1,773,336
Fair value of long term debt instruments designated as measured at fair value through other comprehensive income 6,894,757 4,540,344  
Investments accounted for using equity method Koninklijke KPN [member]      
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Other short-term investments 15,026 62,940  
Changes in fair value of investment 4,560,869 (1,952,414)  
Dividends received 2,628,600 2,119,668 $ 1,742,242
Investments accounted for using equity method in Verizon [Member]      
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Equity investment 61,600,578    
Equity and other short term investments [member] | Investments accounted for using equity method Koninklijke KPN [member]      
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items]      
Equity investments at fair value through other comprehensive income (OCI) $ 56,087,598 $ 50,033,111