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Bank Loans and Notes Payable - Additional Information (Detail)
€ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Aug. 18, 2017
USD ($)
Mar. 14, 2016
EUR (€)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]              
Losses on exchange differences on translation of foreign operations, net of tax     $ (13,174) $ (671) [1] $ 14,482 $ 30,763  
Borrowings     126,228   $ 128,518    
Ireland [member]              
Disclosure of detailed information about borrowings [line items]              
Losses on exchange differences on translation of foreign operations, net of tax     724        
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            
1.75% Senior Notes [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount | €   € 1,000          
Maturity date   7 years          
Fixed interest rate   1.75%          
Basis points over the relevant benchmark mid-swap   155          
Total yield percentage   1.824%          
8.27% Debt Bonds Maturing on 2021 [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount     $ 2,500        
Maturity date     2021 2021      
Fixed interest rate     8.27%       8.27%
5.46% Debt Bonds Maturing on 2023 [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount     $ 7,500        
Maturity date     2023 2023      
Fixed interest rate     5.46%       5.46%
4.63% Senior Notes Maturing on February Fifteen Two Thousand Twenty [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount             $ 500
Maturity date     February 15, 2020 February 15, 2020      
Fixed interest rate     4.63%       4.63%
Two Point Three Eight Percentage Senior Notes Maturing On November Twenty Six Two Thousand Eighteen [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount             $ 445
Maturity date     November 26, 2018 November 26, 2018      
Fixed interest rate     2.38%       2.38%
Three Point Eight Eight Percentage Senior Notes Maturing On November Twenty Six Two Thousand Twenty Three [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount             $ 900
Maturity date     November 26, 2023 November 26, 2023      
Fixed interest rate     3.88%       3.88%
5.25% Senior Notes Maturing On November 26, 2045 [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount             $ 600
Maturity date     November 26, 2043 November 26, 2043      
Fixed interest rate     5.25%       5.25%
TIIE plus 0.5% debt bonds maturing on 2022 [Member]              
Disclosure of detailed information about borrowings [line items]              
Face amount     $ 1,500        
Maturity date     2022 2022      
Basis points over the relevant benchmark mid-swap     0.25 0.25      
7.87% debt bonds maturing on 2027 [member]              
Disclosure of detailed information about borrowings [line items]              
Face amount     $ 8,500        
Maturity date     2027 2027      
Fixed interest rate     7.87%       7.87%
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3