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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, 2019
MXN ($)
Dec. 31, 2019
USD ($)
 [1]
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurements on the Net Defined Benefit Liability $ (1,090) $ (58) $ 551 $ (7) [2]
Net benefit cost recognized in the consolidated statements of income [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost 433   468 374
Past service cost 116     10
Gain or Loss on Settlement or Curtailment 2   (14) (3)
Net Interest on the Net Defined Benefit Liability 379   387 319
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 279   318 244
Past service cost (45)     10
Gain or Loss on Settlement or Curtailment 2   (5) (2)
Net Interest on the Net Defined Benefit Liability 290   304 248
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 139   125 106
Past service cost 161      
Gain or Loss on Settlement or Curtailment     (8) (1)
Net Interest on the Net Defined Benefit Liability 57   49 41
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 15   25 24
Gain or Loss on Settlement or Curtailment     (1)  
Net Interest on the Net Defined Benefit Liability 32   34 30
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 2,166   646 1,291
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 1,608   668 1,061
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 162   (63) 46
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 $ 396   $ 41 $ 184
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] Revised to reflect the discontinued operations of Coca-Cola FEMSA Philippines – See Note 4.2.1