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Financial Instruments - Fair Value of Company's Publicly Traded Debt (Detail) - Level 1 [member] - MXN ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Carrying value $ 123,260 $ 128,664
Fair value $ 128,757 $ 128,741