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Employee Benefits - Summary of Amounts and Types of Securities in Related Parties Included in Portfolio Fund (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt [member] | Cementos Mexicanos. S.A.B. de C.V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities   $ 7
Debt [member] | Grupo Televisa, S.A.B. de C.V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities $ 28 45
Debt [member] | Grupo Financiero Banorte, S.A.B. de C.V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities   7
Debt [member] | BBVA Bancomer, S.A. de C.V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities 10  
Debt [member] | El Puerto de Liverpool, S.A.B. de C.V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities 30 5
Debt [member] | Grupo Industrial Bimbo, S.A.B. de C. V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities $ 5 19
Debt [member] | Gentera, S.A.B. de C.V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities   8
Capital [member] | Grupo Industrial Bimbo, S.A.B. de C. V. [member]    
Disclosure of defined benefit plans [line items]    
Investments in securities   $ 6