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Right-of-use assets and lease debt - Additional Information (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Statement [line items]      
Right of use assets $ 101,976,844 $ 5,112 $ 118,003,223
Lease liabilities 109,327,241    
Amendment of IFRS 16 [Member]      
Statement [line items]      
Adjustment to accrued lease liability 277,680    
Related Party [Member]      
Statement [line items]      
Right of use assets 18,499,851   22,878,245
Lease liabilities $ 20,016,478   $ 23,805,275