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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest in Consolidated Subsidiaries (Detail)
$ in Millions, $ in Millions
Sep. 30, 2019
USD ($)
Sep. 30, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]      
Non-controlling interests $ 337 $ 6,659 $ 6,806
Mexico [member]      
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]      
Non-controlling interests   5,612 5,700
Colombia [member]      
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]      
Non-controlling interests   20 21
Brazil [member]      
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]      
Non-controlling interests   $ 1,027 $ 1,085