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Intangible Assets - Changes in Intangible Assets and Goodwill (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | $ 146,562 | $ 145,610 |
Amortization expense |  | (2,465) | (1,812) | $ (1,913)
Ending balance | $ 7,817 | 155,501 | 146,562 | 145,610
Right to produce and distribute trademark products [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 81,255 | 87,617 |
Ending balance |  | 76,649 | 81,255 | 87,617
Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 47,906 | 40,530 |
Ending balance |  | 52,820 | 47,906 | 40,530
Trademark rights [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 6,600 | 6,699 |
Ending balance |  | 8,647 | 6,600 | 6,699
Other indefinite lived intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 2,160 | 1,977 |
Ending balance |  | 1,424 | 2,160 | 1,977
Total unamortized intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 137,921 | 136,823 |
Ending balance |  | 139,540 | 137,921 | 136,823
Technology costs and management systems [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 4,356 | 4,270 |
Ending balance |  | 4,368 | 4,356 | 4,270
Systems in Development [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 675 | 777 |
Ending balance |  | 432 | 675 | 777
Alcohol licenses [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 1,192 | 1,224 |
Ending balance |  | 1,163 | 1,192 | 1,224
Other [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 2,418 | 2,516 |
Ending balance |  | 9,998 | 2,418 | 2,516
Total amortized intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 8,641 | 8,787 |
Ending balance |  | 15,961 | 8,641 | 8,787
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | (6,869) | (5,738) | (4,574)
Amortization expense |  | (2,465) | (1,811) | (1,913)
Disposals |  | 179 | 475 | 191
Effect of movements in exchange rates |  | 193 | 233 | 235
Changes in value on the recognition of inflation effects |  | (29) | (28) | (52)
Ending balance |  | (8,991) | (6,869) | (5,738)
Accumulated depreciation, amortisation and impairment [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | 375
Accumulated depreciation, amortisation and impairment [member] | Technology costs and management systems [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | (5,207) | (4,437) | (3,262)
Amortization expense |  | (1,536) | (1,351) | (1,453)
Disposals |  | 129 | 445 | 93
Effect of movements in exchange rates |  | 142 | 165 | 236
Changes in value on the recognition of inflation effects |  | (29) | (29) | (51)
Ending balance |  | (6,501) | (5,207) | (4,437)
Accumulated depreciation, amortisation and impairment [member] | Alcohol licenses [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | (637) | (544) | (457)
Amortization expense |  | (97) | (123) | (87)
Disposals |  |  | 30 |
Ending balance |  | (734) | (637) | (544)
Accumulated depreciation, amortisation and impairment [member] | Other [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | (1,025) | (757) | (855)
Amortization expense |  | (832) | (337) | (373)
Disposals |  | 50 |  | 98
Effect of movements in exchange rates |  | 51 | 68 | (1)
Changes in value on the recognition of inflation effects |  |  | 1 | (1)
Ending balance |  | (1,756) | (1,025) | (757)
Accumulated depreciation, amortisation and impairment [member] | Other [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | 375
Accumulated depreciation, amortisation and impairment [member] | Total amortized intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | (6,869) | (5,738) | (4,574)
Amortization expense |  | (2,465) | (1,811) | (1,913)
Disposals |  | 179 | 475 | 191
Effect of movements in exchange rates |  | 193 | 233 | 235
Changes in value on the recognition of inflation effects |  | (29) | (28) | (52)
Ending balance |  | (8,991) | (6,869) | (5,738)
Accumulated depreciation, amortisation and impairment [member] | Total amortized intangible assets [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | 375
Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 153,431 | 151,348 | 158,667
Additions |  | 1,483 | 2,198 | 1,793
Acquisitions from business combinations (see Note 4) |  | 22,804 | 7,782 | 5,997
Changes in fair value of past acquisitions |  | (69) | (22) | 272
Internal development |  |  |  | 41
Disposals |  | (1,190) | (758) | (191)
Effect of movements in exchange rates |  | (10,580) | (7,111) | (10,810)
Changes in value on the recognition of inflation effects |  | 38 | (6) | 57
Ending balance |  | 164,492 | 153,431 | 151,348
Cost [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | (4,478)
Cost [member] | Right to produce and distribute trademark products [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 81,255 | 87,617 | 91,902
Additions |  | 1 |  |
Acquisitions from business combinations (see Note 4) |  |  |  | 4,602
Changes in fair value of past acquisitions |  |  | (2,887) |
Effect of movements in exchange rates |  | (4,607) | (3,475) | (5,005)
Ending balance |  | 76,649 | 81,255 | 87,617
Cost [member] | Right to produce and distribute trademark products [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | (3,882)
Cost [member] | Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 47,906 | 40,530 | 43,449
Additions |  |  |  | 75
Acquisitions from business combinations (see Note 4) |  | 12,080 | 6,542 | 842
Changes in fair value of past acquisitions |  | (1,323) | 2,903 | 272
Disposals |  | (183) |  |
Effect of movements in exchange rates |  | (4,466) | (2,069) | (4,108)
Ending balance |  | 52,820 | 47,906 | 40,530
Cost [member] | Trademark rights [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 6,600 | 6,699 | 7,185
Acquisitions from business combinations (see Note 4) |  | 2,101 | 469 | 170
Changes in fair value of past acquisitions |  | 347 |  |
Disposals |  | (116) | (48) |
Effect of movements in exchange rates |  | (70) | (520) | (656)
Ending balance |  | 8,647 | 6,600 | 6,699
Cost [member] | Other indefinite lived intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 2,160 | 1,977 | 2,257
Additions |  |  | 164 | 71
Changes in fair value of past acquisitions |  | (361) | 153 |
Disposals |  | (305) |  | (2)
Effect of movements in exchange rates |  | (59) | (134) | (349)
Ending balance |  | 1,424 | 2,160 | 1,977
Cost [member] | Total unamortized intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 137,921 | 136,823 | 144,793
Additions |  | 1 | 164 | 146
Acquisitions from business combinations (see Note 4) |  | 14,181 | 7,011 | 5,614
Changes in fair value of past acquisitions |  | (1,337) | 169 | 272
Disposals |  | (604) | (48) | (2)
Effect of movements in exchange rates |  | (9,202) | (6,198) | (10,118)
Ending balance |  | 139,540 | 137,921 | 136,823
Cost [member] | Total unamortized intangible assets [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | (3,882)
Cost [member] | Technology costs and management systems [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 9,563 | 8,707 | 7,103
Additions |  | 771 | 824 | 1,051
Acquisitions from business combinations (see Note 4) |  | 26 | 759 | 35
Changes in fair value of past acquisitions |  |  | (6) |
Transfer of completed development systems |  | 397 | 412 | 904
Disposals |  | (164) | (580) | (43)
Effect of movements in exchange rates |  | 276 | (553) | (343)
Ending balance |  | 10,869 | 9,563 | 8,707
Cost [member] | Systems in Development [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 675 | 777 | 1,291
Additions |  | 202 | 334 | 371
Acquisitions from business combinations (see Note 4) |  |  |  | 57
Transfer of completed development systems |  | (399) | (413) | (904)
Disposals |  | (6) |  |
Effect of movements in exchange rates |  | (40) | (23) | (38)
Ending balance |  | 432 | 675 | 777
Cost [member] | Alcohol licenses [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 1,829 | 1,768 | 1,637
Additions |  | 111 | 191 | 131
Disposals |  | (43) | (130) |
Ending balance |  | 1,897 | 1,829 | 1,768
Cost [member] | Other [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 3,443 | 3,273 | 3,843
Additions |  | 398 | 685 | 94
Acquisitions from business combinations (see Note 4) |  | 8,597 | 12 | 291
Changes in fair value of past acquisitions |  | 1,268 | (185) |
Internal development |  |  |  | 41
Transfer of completed development systems |  | 2 | 1 |
Disposals |  | (373) |  | (146)
Effect of movements in exchange rates |  | (1,614) | (337) | (311)
Changes in value on the recognition of inflation effects |  | 38 | (6) | 57
Ending balance |  | 11,754 | 3,443 | 3,273
Cost [member] | Other [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | (596)
Cost [member] | Total amortized intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance |  | 15,510 | 14,525 | 13,874
Additions |  | 1,482 | 2,034 | 1,647
Acquisitions from business combinations (see Note 4) |  | 8,623 | 771 | 383
Changes in fair value of past acquisitions |  | 1,268 | (191) |
Internal development |  |  |  | 41
Disposals |  | (586) | (710) | (189)
Effect of movements in exchange rates |  | (1,378) | (913) | (692)
Changes in value on the recognition of inflation effects |  | 38 | (6) | 57
Ending balance |  | 24,952 | $ 15,510 | 14,525
Cost [member] | Total amortized intangible assets [member] | Philippines [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  |  |  | $ (596)
Specialty’s Café & Bakery, Inc [Member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  | (1,426) |  |
Specialty’s Café & Bakery, Inc [Member] | Cost [member] | Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  | (1,194) |  |
Specialty’s Café & Bakery, Inc [Member] | Cost [member] | Trademark rights [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  | (215) |  |
Specialty’s Café & Bakery, Inc [Member] | Cost [member] | Other indefinite lived intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  | (11) |  |
Specialty’s Café & Bakery, Inc [Member] | Cost [member] | Total unamortized intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  | (1,420) |  |
Specialty’s Café & Bakery, Inc [Member] | Cost [member] | Other [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  | (5) |  |
Specialty’s Café & Bakery, Inc [Member] | Cost [member] | Total amortized intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Disposals |  | $ (5) |  |

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