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Employee Benefits - Summary of Amount Recognized in Consolidated Income Statements and Consolidated Statements of Comprehensive Income (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 408 $ 359 $ 343
Remeasurements on the Net Defined Benefit Liability (7) (167) 144
Net benefit cost recognized in the consolidated statements of income [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 471 359 343
Past service cost 10 45 3
Gain or Loss on Settlement or Curtailment (3) (61) (129)
Net Interest on the Net Defined Benefit Liability 338 282 276
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 341 245 233
Past service cost 10 45 3
Gain or Loss on Settlement or Curtailment (2) (61) (120)
Net Interest on the Net Defined Benefit Liability 267 224 212
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 106 93 88
Gain or Loss on Settlement or Curtailment (1)   (9)
Net Interest on the Net Defined Benefit Liability 41 34 32
Net benefit cost recognized in the consolidated statements of income [member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 24 21 16
Net Interest on the Net Defined Benefit Liability 30 24 23
Net benefit cost recognized in the consolidated statements of income [member] | Post-employment [member] | Venezuela [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost     6
Net Interest on the Net Defined Benefit Liability     9
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 1,290 1,270 1,071
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 1,060 1,102 913
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 46 18 39
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements on the Net Defined Benefit Liability $ 184 $ 151 $ 119