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Investments - Schedule of Investments Classified as Amortized Cost (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Disclosure Of Investments [line items]      
Total investments $ 30,924 $ 1,575 $ 2,160
Fixed rate debt [member]      
Disclosure Of Investments [line items]      
Total fixed rate/variable rate 910   2,160
Fixed rate debt [member] | US Government agencies debt securities [member]      
Disclosure Of Investments [line items]      
Acquisition cost     1,934
Fixed rate debt [member] | Corporate debt securities [member]      
Disclosure Of Investments [line items]      
Acquisition cost 906   222
Accrued interest 4   $ 4
Variable rate debt [member]      
Disclosure Of Investments [line items]      
Total fixed rate/variable rate 30,014    
Variable rate debt [member] | US Government agencies debt securities [member]      
Disclosure Of Investments [line items]      
Acquisition cost 8,660    
Accrued interest 28    
Variable rate debt [member] | Corporate debt securities [member]      
Disclosure Of Investments [line items]      
Acquisition cost 21,259    
Accrued interest $ 67    
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3