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Information by Segment - Summary of Segment Disclosure for Company's Consolidated Operations (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
USD ($)
Disclosure of operating segments [line items]          
Revenue $ 203,780 $ 10,376 $ 177,718 $ 152,360  
Gross profit 91,686 4,668 79,662 72,030  
Income before income taxes (7,100) (362) 14,455 14,880  
Depreciation and amortization 10,864   8,666 7,144  
Total assets 285,677   279,256 210,249 $ 14,546
Total liabilities 144,967   150,023 101,514 $ 7,381
Capital expenditures 14,612   12,391 11,484  
Equity in earnings of associated companies and joint ventures 60 $ 3 147 155  
Mexico and central America segment [member]          
Disclosure of operating segments [line items]          
Gross profit 45,106   43,569 40,130  
Depreciation and amortization 4,801   4,750 4,404  
Total assets 135,363   136,252 133,941  
Total liabilities 91,385   95,342 80,963  
Capital expenditures 8,231   6,597 4,672  
Equity in earnings of associated companies and joint ventures (63)   149 97  
South America segment [member]          
Disclosure of operating segments [line items]          
Gross profit 37,756   29,263 27,532  
Depreciation and amortization 3,442   3,078 2,489  
Total assets 122,042   130,019 69,281  
Total liabilities 43,637   48,391 17,528  
Capital expenditures 4,686   4,240 5,686  
Equity in earnings of associated companies and joint ventures 123   (2) 58  
Asia [member] | Separate reportable segment under IFRS eight [member]          
Disclosure of operating segments [line items]          
Revenue     22,768 19,576  
Gross profit     7,678 5,325  
Income before income taxes     486 334  
Depreciation and amortization     2,163 2,369  
Total assets     28,066 22,002  
Total liabilities     9,634 6,493  
Capital expenditures     3,342 1,778  
Asia [member] | Coca-Cola FEMSA Philippines, Inc. [member] | Mexico and central America segment [member]          
Disclosure of operating segments [line items]          
Equity in earnings of associated companies and joint ventures     93 86  
Asia [member] | Coca-Cola FEMSA Philippines, Inc. [member] | Separate reportable segment under IFRS eight [member]          
Disclosure of operating segments [line items]          
Equity in earnings of associated companies and joint ventures     11,460 9,996  
Mexico [member] | Mexico and central America segment [member]          
Disclosure of operating segments [line items]          
Revenue 79,836   74,413 67,772  
Total assets 133,315   122,552 123,585  
Total liabilities 88,283   92,303 78,834  
Brazil [member] | South America segment [member]          
Disclosure of operating segments [line items]          
Revenue 58,518   43,900 37,825  
Total assets 95,713   104,092 49,448  
Total liabilities 31,580   39,600 10,753  
Colombia [member] | South America segment [member]          
Disclosure of operating segments [line items]          
Revenue 14,222   15,120 12,984  
Total assets 14,180   20,581 15,182  
Total liabilities 7,993   5,547 3,977  
Argentina [member] | South America segment [member]          
Disclosure of operating segments [line items]          
Revenue 13,869   12,273 13,943  
Total assets 5,301   5,346 4,651  
Total liabilities $ 3,660   $ 3,244 $ 2,798