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Balances and Transactions in Foreign Currencies - Balances (Detail) - MXN ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets $ 70,137 $ 59,648
Long-Term Assets 2,492 2,045
Short-Term Liabilities 6,069 6,018
Long-Term Liabilities 146,521 78,198
USD    
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets 69,612 58,151
Long-Term Assets 1,143 452
Short-Term Liabilities 5,590 5,597
Long-Term Liabilities 122,000 57,075
Euro [member]    
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets 479 877
Short-Term Liabilities 458 363
Long-Term Liabilities 24,521 21,122
Other currencies [member]    
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets 46 620
Long-Term Assets 1,349 1,593
Short-Term Liabilities $ 21 58
Long-Term Liabilities   $ 1