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Financial Instruments - Additional Information - Other Financial Obligations (Detail)
$ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions, $ in Millions
 12 Months Ended
Jun. 19, 2017
MXN ($)
shares
Mar. 30, 2017
MXN ($)
Mar. 31, 2016
MXN ($)
Mar. 15, 2011
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
Dec. 31, 2009
MXN ($)
$ / shares
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Jun. 19, 2017
USD ($)
shares
Dec. 31, 2015
MXN ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2009
USD ($)
Disclosure of detailed information about financial instruments [line items]                            
Increase common stock value   $ 5 $ 4                      
Additional paid-in capital   $ 9,459 $ 6,966   $ 140,483     $ 141,151            
Convertible Subordinated Notes Due 2020 [Member]                            
Disclosure of detailed information about financial instruments [line items]                            
Debt interest percentage                       3.72% 3.72%  
Conversion price | $ / shares                 $ 11.01 $ 11.01        
Conversion rate per dollars         90.8592     90.8592            
Convertible subordinated notes due 2018 [member]                            
Disclosure of detailed information about financial instruments [line items]                            
Debt principal amount       $ 690                    
Debt interest percentage       3.75%                    
Debt instrument maturity date         2018                  
Debt instrument conversion amount                     $ 325      
Issuance of ADS | shares 43                   43      
Liability component of converted notes $ 5,468                          
Mandatory Convertible Securities [Member] | CPO [Member]                            
Disclosure of detailed information about financial instruments [line items]                            
Conversion price | $ / shares             $ 17.48              
Rate required for converting the note per CPO | $ / shares             $ 26.22              
Nominal value of securities converted             $ 236              
Mandatory Convertible Securities [Member] | Mandatory Convertible Securities 2019 [Member]                            
Disclosure of detailed information about financial instruments [line items]                            
Debt principal amount                           $ 315
Debt interest percentage             10.00%             10.00%
Debt instrument maturity date           2019                
Reserve of Equity Component of Convertible Instruments [Member] | Convertible Subordinated Notes Due 2020 [Member]                            
Disclosure of detailed information about financial instruments [line items]                            
Fair value of conversion price                       $ 199    
Parent [member] | Convertible Subordinated Notes Due 2020 [Member]                            
Disclosure of detailed information about financial instruments [line items]                            
Debt principal amount                         $ 521  
Parent [member] | Convertible subordinated notes due 2018 [member]                            
Disclosure of detailed information about financial instruments [line items]                            
Increase common stock value 4                          
Additional paid-in capital 7,059                          
Expense for inducement premiums paid in shares $ 769                          
Repayment of debt       $ 365