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Investments - Schedule of Investments Classified as Amortized Cost (Detail)
$ in Millions, $ in Millions
Jun. 30, 2019
MXN ($)
Jun. 30, 2019
USD ($)
 [1],[2]
Dec. 31, 2018
MXN ($)
Disclosure Of Investments [line items]      
Total investments $ 21,340 [1] $ 1,111 $ 30,924
Fixed rate debt [member]      
Disclosure Of Investments [line items]      
Total fixed rate/variable rate 519   910
Fixed rate debt [member] | Corporate debt securities [member]      
Disclosure Of Investments [line items]      
Acquisition cost 518   906
Accrued interest 1   4
Variable rate debt [member]      
Disclosure Of Investments [line items]      
Total fixed rate/variable rate 20,821   30,014
Variable rate debt [member] | US Government agencies debt securities [member]      
Disclosure Of Investments [line items]      
Acquisition cost 3,834   8,660
Accrued interest 15   28
Variable rate debt [member] | Corporate debt securities [member]      
Disclosure Of Investments [line items]      
Acquisition cost 16,868   21,259
Accrued interest $ 104   $ 67
[1] The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospective method under which the comparative information is not restated. - See Note 2.4.1
[2] Convenience translation to U.S. dollars ($) - See Note 2.2.3