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Subsequent Events - Schedule of Outstanding Shares Prior to Stock Split (Detail) - shares
Jan. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of non-adjusting events after reporting period [line items]      
Outstanding shares   17,891,131,350 17,891,131,350
Major ordinary share transactions prior to stock split [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Outstanding shares 2,100,832,262    
% of the capital stock 100.00%    
% of rdinary shares with full voting rights 100.00%    
Major ordinary share transactions prior to stock split [member] | Series A shares [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Shareholders Wholly-owned subsidiary of Fomento Económico Mexicano, S.A.B. de C.V.    
Outstanding shares 992,078,519    
% of the capital stock 47.223%    
% of rdinary shares with full voting rights 62.964%    
Major ordinary share transactions prior to stock split [member] | Series D shares [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Shareholders Wholly-owned subsidiaries of The Coca-Cola Company    
Outstanding shares 583,545,678    
% of the capital stock 27.777%    
% of rdinary shares with full voting rights 37.036%    
Major ordinary share transactions prior to stock split [member] | Series L share [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Shareholders Public float    
Outstanding shares 525,208,065    
% of the capital stock 25.00%    
% of rdinary shares with full voting rights 0.00%