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Financial Instruments - Fair Value of Company's Publicly Traded Debt (Detail) - MXN ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Financial Assets and Financial Liabilities [Line Items]        
Carrying value $ 172,630 $ 128,664 $ 131,348 $ 139,248
Level 1 [member]        
Disclosure of Financial Assets and Financial Liabilities [Line Items]        
Carrying value 117,951 128,664    
Fair value $ 124,038 $ 128,741