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Balances and Transactions in Foreign Currencies - Balances (Details) - MXN ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets $ 75,114 $ 70,137
Long-Term Assets 2,308 2,492
Short-Term Liabilities 7,222 6,069
Long-Term Liabilities 153,343 146,521
U S dollar    
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets 74,994 69,612
Long-Term Assets 983 1,143
Short-Term Liabilities 6,310 5,590
Long-Term Liabilities 125,447 122,000
Euro    
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets 74 479
Short-Term Liabilities 355 458
Long-Term Liabilities 27,896 24,521
Other currencies    
Disclosure of Balances and Transactions in Foreign Currencies [line items]    
Short-Term Assets 46 46
Long-Term Assets 1,325 1,349
Short-Term Liabilities $ 557 $ 21