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Employee Benefits - Summary of Amount Recognized in Consolidated Income Statements and Consolidated Statements of Comprehensive Income (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability $ 551 $ 28 $ (7) $ (167)
Net benefit cost recognized in the consolidated statements of income [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost 468   374 359
Past service cost     10 46
Gain or Loss on Settlement or Curtailment (14)   (3) (61)
Net Interest on the Net Defined Benefit Liability 387   319 282
Net benefit cost recognized in the consolidated statements of income [member] | Pension and retirement plans [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost 318   244 245
Past service cost     10 45
Gain or Loss on Settlement or Curtailment (5)   (2) (61)
Net Interest on the Net Defined Benefit Liability 304   248 224
Net benefit cost recognized in the consolidated statements of income [member] | Seniority premiums [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost 125   106 93
Past service cost       1
Gain or Loss on Settlement or Curtailment (8)   (1)  
Net Interest on the Net Defined Benefit Liability 49   41 34
Net benefit cost recognized in the consolidated statements of income [member] | Post retirement medical services [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost 25   24 21
Gain or Loss on Settlement or Curtailment (1)      
Net Interest on the Net Defined Benefit Liability 34   30 24
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability 646   1,291 1,271
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Pension and retirement plans [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability 668   1,061 1,102
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Seniority premiums [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability (63)   46 18
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Post retirement medical services [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability $ 41   $ 184 $ 151
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3