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Bank Loans and Notes Payables - Additional Information (Detail)
$ in Millions, $ in Millions
12 Months Ended
Aug. 18, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 81,303   $ 87,336
8.27% debt bonds, maturing in 2021 [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount   $ 2,500    
Maturity date   2021    
Fixed interest rate   8.27% 8.27%  
5.46% debt bonds maturing in 2023 [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount   $ 7,500    
Maturity date   2023    
Fixed interest rate   5.46% 5.46%  
4.63% senior notes, maturity date on Feb. 15, 2020 [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount     $ 500  
Maturity date   February 15, 2020    
Fixed interest rate   4.63% 4.63%  
2.38% senior notes, maturity date on Nov. 26, 2018 [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount     $ 445  
Maturity date   November 26, 2018    
Fixed interest rate   2.38% 2.38%  
3.88% senior notes, maturity date on Nov. 26, 2023 [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount     $ 900  
Maturity date   November 26, 2023    
Fixed interest rate   3.88% 3.88%  
5.25% senior notes, maturity date on Nov. 26, 2043 [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount     $ 600  
Maturity date   November 26, 2043    
Fixed interest rate   5.25% 5.25%  
TIIE + 0.25% Debt Bonds Maturing on 2022 [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount   $ 1,500    
Maturity date   2022    
Floating interest rate   0.25    
Seven point eight seven percentage debt bonds maturing on two thousand twenty seven [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal amount   $ 8,500    
Maturity date   2027    
Fixed interest rate   7.87% 7.87%  
2.38% debt bonds maturing on 2018 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity date 2018      
Fixed interest rate 2.38%      
Repayment of bonds $ 555      
Borrowings $ 445