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Taxes - Deferred income tax in financial statements (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | $ (13,575) | $ (10,657) |  | $ (16,010) | $ (9,720)
Deferred income tax related to consolidated statement of income | $ (4,071) | (1,583) | (296) |  |  |
Deferred tax income net recorded in share of the profit of equity accounted investees | 200 | 407 | (15) |  |  |
Total deferred tax income expense | $ (3,871) | (1,176) | (311) |  |  |
Deferred tax asset |  | (20,521) |  | $ (1,108) | (22,043) |
Deferred tax liability |  | 6,946 |  | $ 303 | 6,033 |
Deferred tax recovery period | 10 years |  |  |  |  |
Allowance for doubtful accounts [member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (437) |  |  | (501) |
Deferred income tax related to consolidated statement of income | $ (25) | (43) | 93 |  |  |
Inventory [member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | 76 |  |  | (757) |
Deferred income tax related to consolidated statement of income | 60 | (6) | (27) |  |  |
Other Current Assets [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | 256 |  |  | 122 |
Deferred income tax related to consolidated statement of income | (163) | 182 | (31) |  |  |
Property, plant and equipment [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (4,068) |  |  | (4,999) |
Deferred income tax related to consolidated statement of income | (708) | (320) | (851) |  |  |
Investments in equity accounted investees [member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (5,482) |  |  | (9,321) |
Deferred income tax related to consolidated statement of income | (15) | 7 | 40 |  |  |
Other assets [member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | 137 |  |  | (681) |
Deferred income tax related to consolidated statement of income | (729) | 59 | (82) |  |  |
Finite useful lived intangible assets [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (111) |  |  | (181) |
Deferred income tax related to consolidated statement of income | 129 | (345) | 627 |  |  |
Indefinite lived intangible assets [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | 10,788 |  |  | 9,316 |
Deferred income tax related to consolidated statement of income | (261) | 1,220 | 758 |  |  |
Post-employment and other long-term employee benefits [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (1,067) |  |  | (1,124) |
Deferred income tax related to consolidated statement of income | (37) | (2) | (148) |  |  |
Derivative Financial Instruments [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (9) |  |  | (121) |
Deferred income tax related to consolidated statement of income | (114) | (31) | (63) |  |  |
Provisions [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (1,216) |  |  | 1,135 |
Deferred income tax related to consolidated statement of income | 142 | 1,359 | 1,122 |  |  |
Temporary non-deductible provision [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (3,183) |  |  | (4,907) |
Deferred income tax related to consolidated statement of income | (1,893) | (1,797) | (293) |  |  |
Employee profit sharing payable [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (430) |  |  | (371) |
Deferred income tax related to consolidated statement of income | 64 | 8 | (27) |  |  |
Tax loss carry forwards [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (10,309) |  |  | (8,422) |
Deferred income tax related to consolidated statement of income | 1,994 | (1,201) | (927) |  |  |
Tax credits to recover [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (1,855) |  |  | (2,595) |
Deferred income tax related to consolidated statement of income | (1,629) | (122) | (109) |  |  |
Other comprehensive income [member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (596) |  |  | 33 |
Deferred income tax related to consolidated statement of income | 86 | 29 | (54) |  |  |
Exchange differences on translation of foreign operations in OCI [member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | 3,959 |  |  | 7,697 |
Other Liabilities [Member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | 533 |  |  | 717 |
Deferred income tax related to consolidated statement of income | (440) | (3) | $ (324) |  |  |
Right of use assets from leases [member] |  |  |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |  |  |
Deferred tax (liability)/asset, net |  | (561) |  |  | $ (1,049) |
Deferred income tax related to consolidated statement of income | $ (532) | $ (577) |  |  |  |

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