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Property, plant & equipment - Summary of Premises and Equipment (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
 [2]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   $ 61,187 [1] $ 61,942  
Ending balance $ 2,989 59,460 61,187 [1] $ 61,942
Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   106,224 102,998 125,000
Additions   9,655 10,324 9,917
Additions from business combinations   245 405 3,094
Transfer of completed projects in progress   0 0 0
Disposals   (3,175) (3,749) (1,612)
Effects of changes in foreign exchange rates   (5,608) (6,099) (6,259)
Changes in value on the recognition of inflation effects   1,824 2,345 4,760
Ending balance   109,165 106,224 102,998
Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (31,902)
Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   (45,037) (41,056) (49,173)
Depreciation for the year   (8,415) (8,387) (8,404)
Disposals   2,706 3,145 1,296
Effects of changes in foreign exchange rates   2,111 2,464 1,495
Changes in value on the recognition of inflation effects   (1,070) (1,203) (2,480)
Ending balance   (49,705) (45,037) (41,056)
Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       16,210
Land        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   5,258 5,575  
Ending balance   5,240 5,258 5,575
Land | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   5,258 5,575 9,865
Additions   0 4 31
Additions from business combinations   158 142 25
Transfer of completed projects in progress   4 (253) 504
Disposals   (13) (1) (50)
Effects of changes in foreign exchange rates   (255) (323) (388)
Changes in value on the recognition of inflation effects   88 114 242
Ending balance   5,240 5,258 5,575
Land | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (4,654)
Land | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   0 0 0
Depreciation for the year   0 0 0
Disposals   0 0 0
Effects of changes in foreign exchange rates   0 0 0
Changes in value on the recognition of inflation effects   0 0 0
Ending balance   0 0 0
Land | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       0
Buildings        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   14,091 14,361  
Ending balance   13,610 14,091 14,361
Buildings | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   18,746 18,775 20,729
Additions   104 27 8
Additions from business combinations   0 227 451
Transfer of completed projects in progress   721 508 304
Disposals   (29) (35) (71)
Effects of changes in foreign exchange rates   (1,182) (1,122) (1,089)
Changes in value on the recognition of inflation effects   293 366 814
Ending balance   18,653 18,746 18,775
Buildings | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (2,371)
Buildings | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   (4,655) (4,414) (4,616)
Depreciation for the year   (490) (386) (445)
Disposals   19 14 15
Effects of changes in foreign exchange rates   165 223 154
Changes in value on the recognition of inflation effects   (82) (92) (222)
Ending balance   (5,043) (4,655) (4,414)
Buildings | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       700
Machinery and Equipment        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   20,521 21,496  
Ending balance   19,822 20,521 21,496
Machinery and Equipment | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   38,919 38,465 47,146
Additions   171 392 1,356
Additions from business combinations   87 50 1,500
Transfer of completed projects in progress   3,165 2,650 1,160
Disposals   (1,425) (1,577) (555)
Effects of changes in foreign exchange rates   (2,243) (2,315) (3,072)
Changes in value on the recognition of inflation effects   990 1,254 2,551
Ending balance   39,664 38,919 38,465
Machinery and Equipment | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (11,621)
Machinery and Equipment | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   (18,398) (16,969) (19,620)
Depreciation for the year   (2,828) (2,862) (2,880)
Disposals   1,125 1,049 497
Effects of changes in foreign exchange rates   854 1,013 312
Changes in value on the recognition of inflation effects   (595) (629) (1,403)
Ending balance   (19,842) (18,398) (16,969)
Machinery and Equipment | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       6,125
Refrigeration Equipment        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   9,378 9,757  
Ending balance   8,343 9,378 9,757
Refrigeration Equipment | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   20,410 19,963 20,083
Additions   281 816 961
Additions from business combinations   0 (13) 537
Transfer of completed projects in progress   1,192 1,396 1,711
Disposals   (1,073) (1,032) (615)
Effects of changes in foreign exchange rates   (797) (961) (765)
Changes in value on the recognition of inflation effects   189 241 466
Ending balance   20,202 20,410 19,963
Refrigeration Equipment | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (2,415)
Refrigeration Equipment | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   (11,032) (10,206) (10,688)
Depreciation for the year   (2,148) (2,211) (2,086)
Disposals   989 966 579
Effects of changes in foreign exchange rates   464 583 244
Changes in value on the recognition of inflation effects   (132) (164) (338)
Ending balance   (11,859) (11,032) (10,206)
Refrigeration Equipment | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       2,083
Returnable Bottles        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   6,061 6,043  
Ending balance   5,771 6,061 6,043
Returnable Bottles | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   16,153 14,749 21,532
Additions   2,613 2,581 2,888
Additions from business combinations   0 0 393
Transfer of completed projects in progress   57 360 3
Disposals   (561) (1,056) (312)
Effects of changes in foreign exchange rates   (629) (833) (251)
Changes in value on the recognition of inflation effects   291 352 612
Ending balance   17,924 16,153 14,749
Returnable Bottles | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (10,116)
Returnable Bottles | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   (10,092) (8,706) (13,422)
Depreciation for the year   (2,779) (2,734) (2,827)
Disposals   536 1,079 204
Effects of changes in foreign exchange rates   432 571 631
Changes in value on the recognition of inflation effects   (250) (302) (517)
Ending balance   (12,153) (10,092) (8,706)
Returnable Bottles | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       7,225
Investments in Fixed Assets in Progress        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   5,156 4,131  
Ending balance   5,894 5,156 4,131
Investments in Fixed Assets in Progress | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   5,156 4,131 3,874
Additions   6,300 6,392 4,578
Additions from business combinations   0 0 145
Transfer of completed projects in progress   (5,187) (5,004) (3,722)
Disposals   (12) 0 0
Effects of changes in foreign exchange rates   (333) (381) (321)
Changes in value on the recognition of inflation effects   (30) 18 66
Ending balance   5,894 5,156 4,131
Investments in Fixed Assets in Progress | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (489)
Investments in Fixed Assets in Progress | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   0 0 0
Depreciation for the year   0 0 0
Disposals   0 0 0
Effects of changes in foreign exchange rates   0 0 0
Changes in value on the recognition of inflation effects   0 0 0
Ending balance   0 0 0
Investments in Fixed Assets in Progress | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       0
Leasehold Improvements        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   417 203  
Ending balance   358 417 203
Leasehold Improvements | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   782 479 775
Additions   0 0 0
Additions from business combinations   0 7 2
Transfer of completed projects in progress   48 343 20
Disposals   (5) (13) (1)
Effects of changes in foreign exchange rates   (91) (34) (81)
Changes in value on the recognition of inflation effects   3 0 0
Ending balance   737 782 479
Leasehold Improvements | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       (236)
Leasehold Improvements | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   (365) (276) (330)
Depreciation for the year   (40) (108) (35)
Disposals   1 9 1
Effects of changes in foreign exchange rates   31 12 11
Changes in value on the recognition of inflation effects   (6) (2) 0
Ending balance   (379) (365) (276)
Leasehold Improvements | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       77
Other        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   305 376  
Ending balance   422 305 376
Other | Cost        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   800 861 996
Additions   186 112 95
Additions from business combinations   0 (8) 41
Transfer of completed projects in progress   0 0 20
Disposals   (57) (35) (8)
Effects of changes in foreign exchange rates   (78) (130) (292)
Changes in value on the recognition of inflation effects   0 0 9
Ending balance   851 800 861
Other | Cost | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       0
Other | Accumulated Depreciation        
Reconciliation of changes in property, plant and equipment [abstract]        
Beginning balance   (495) (485) (497)
Depreciation for the year   (130) (86) (131)
Disposals   36 28 0
Effects of changes in foreign exchange rates   165 62 143
Changes in value on the recognition of inflation effects   (5) (14) 0
Ending balance   $ (429) $ (495) (485)
Other | Accumulated Depreciation | Philippines disposal        
Reconciliation of changes in property, plant and equipment [abstract]        
Disposals       $ 0
[1] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] Convenience translation to U.S. dollars ($) – See Note 2.2.3