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Other Liabilities, Provisions, Contingencies and Commitments - Changes in Balance of Provisions Recorded (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial liabilities [line items]      
Balance at beginning of the period $ 8,854    
Reversal of indemnifiable items (1,177)    
Balance at end of the period 6,303 $ 8,854  
Spaipa SA Industria Brasileira de Bebidas [Member]      
Disclosure of financial liabilities [line items]      
Reversal of indemnifiable items (899)    
Indirect taxes [member]      
Disclosure of financial liabilities [line items]      
Balance at beginning of the period 5,062 5,421 $ 6,836
Penalties and other charges   1 123
New contingencies 489 486 178
Contingencies added in business combination     104
Cancellation and expiration (153) (247) 106
Payments (218) (174) (112)
Effects of changes in foreign exchange rates (850) (425) (951)
Effects due to derecognition of Philippines     (863)
Balance at end of the period 3,153 5,062 5,421
Labor [member]      
Disclosure of financial liabilities [line items]      
Balance at beginning of the period 2,455 2,601 2,723
Penalties and other charges 233 293 310
New contingencies 249 521 330
Contingencies added in business combination   44 289
Cancellation and expiration (61) (283) (133)
Payments (592) (500) (193)
Effects of changes in foreign exchange rates (427) (221) (725)
Balance at end of the period 1,857 2,455 2,601
Legal [member]      
Disclosure of financial liabilities [line items]      
Balance at beginning of the period 1,337 1,906 3,296
Penalties and other charges 8 94 86
New contingencies 362 213 72
Contingencies added in business combination   77 67
Cancellation and expiration (141) (542) (146)
Payments (111) (318) (251)
Effects of changes in foreign exchange rates (162) (93) (335)
Effects due to derecognition of Philippines     (883)
Balance at end of the period $ 1,293 $ 1,337 $ 1,906