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Financial Assets and Liabilities - Summary of Fair Value for Financial Assets (Excluding Cash and Cash Equivalents) and Financial Liabilities (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Financial Assets $ 260,844,607 $ 257,974,604
Liabilities:    
Financial Liabilities 813,864,161 711,544,172
Debt [member]    
Liabilities:    
Financial Liabilities 683,670,677 694,436,593
Financial instruments, class [member]    
Liabilities:    
Financial Liabilities 9,596,751 17,107,579
Equity investments at fair value through OCI and other short term investments [member]    
Assets:    
Financial Assets 47,718,025 49,015,934
Pension plan assets [member]    
Assets:    
Financial Assets 206,300,822 203,671,122
Derivative Financial Instruments [Member]    
Assets:    
Financial Assets 6,825,760 5,287,548
Liability Related to Right of Use of Assets [Member]    
Liabilities:    
Financial Liabilities 120,596,733  
Level 1 [member]    
Assets:    
Financial Assets 223,554,271 225,585,814
Liabilities:    
Financial Liabilities 702,599,989 594,713,342
Level 1 [member] | Debt [member]    
Liabilities:    
Financial Liabilities 582,003,256 594,713,342
Level 1 [member] | Equity investments at fair value through OCI and other short term investments [member]    
Assets:    
Financial Assets 37,572,410 39,028,083
Level 1 [member] | Pension plan assets [member]    
Assets:    
Financial Assets 185,981,861 186,557,731
Level 1 [member] | Liability Related to Right of Use of Assets [Member]    
Liabilities:    
Financial Liabilities 120,596,733  
Level 2 [member]    
Assets:    
Financial Assets 37,265,932 32,371,743
Liabilities:    
Financial Liabilities 111,264,172 116,830,830
Level 2 [member] | Debt [member]    
Liabilities:    
Financial Liabilities 101,667,421 99,723,251
Level 2 [member] | Financial instruments, class [member]    
Liabilities:    
Financial Liabilities 9,596,751 17,107,579
Level 2 [member] | Equity investments at fair value through OCI and other short term investments [member]    
Assets:    
Financial Assets 10,145,615 9,987,851
Level 2 [member] | Pension plan assets [member]    
Assets:    
Financial Assets 20,294,557 17,096,344
Level 2 [member] | Derivative Financial Instruments [Member]    
Assets:    
Financial Assets 6,825,760 5,287,548
Level 3 [member]    
Assets:    
Financial Assets 24,404 17,047
Level 3 [member] | Pension plan assets [member]    
Assets:    
Financial Assets $ 24,404 $ 17,047