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Balances and Transactions in Foreign Currencies - Summary of Balances and Transactions in Foreign Currencies (Detail)
€ in Millions, $ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
 [2]
Dec. 31, 2019
EUR (€)
Disclosure of Balances and Transactions in Foreign Currencies [line items]            
Current assets $ 3,642 [1] $ 72,440     $ 56,796  
Noncurrent assets 9,583 [1] 190,626     201,043  
Current liabilities 2,154 [1] 42,845     51,010  
Noncurrent liabilities 4,915 [1] $ 97,764     $ 77,144  
U.S. dollars            
Disclosure of Balances and Transactions in Foreign Currencies [line items]            
Current assets | $ 21,787     $ 11,122    
Noncurrent assets | $ 4     93    
Current liabilities | $ 2,645     2,762    
Noncurrent liabilities | $ $ 50,969     $ 37,691    
Euros            
Disclosure of Balances and Transactions in Foreign Currencies [line items]            
Current assets | €     € 0     € 0
Noncurrent assets | €     0     0
Current liabilities | €     95     49
Noncurrent liabilities | €     € 0     € 0
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18