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Financial Instruments - Impact of Hedging On Equity (Details) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | $ (1,065) | $ (230)
Financial instruments – purchases | (270) | (126)
Change in fair value of financial instruments recognized in OCI | 3,077 | (2,175)
Amount reclassified from OCI to profit or loss | 1,986 | 1,378
Foreign currency revaluation of the net foreign operations | (4,118) | (333)
Effects of changes in foreign exchange rates | 121 | 42
Tax effect | (253) | 379
Financial instruments designated as hedging instruments, at fair value, ending balance | (522) | (1,065)
Non-controlling interest |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | (97) | (81)
Financial instruments – purchases | 53 | 8
Change in fair value of financial instruments recognized in OCI | 414 | (58)
Amount reclassified from OCI to profit or loss | 199 | 182
Foreign currency revaluation of the net foreign operations | (530) | (157)
Effects of changes in foreign exchange rates | 16 | 0
Tax effect | (52) | 9
Financial instruments designated as hedging instruments, at fair value, ending balance | 3 | (97)
Foreign exchange forward contracts |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | (208) | 29
Financial instruments – purchases | (837) | (267)
Change in fair value of financial instruments recognized in OCI | 0 | 0
Amount reclassified from OCI to profit or loss | 286 | (69)
Foreign currency revaluation of the net foreign operations | 0 | 0
Effects of changes in foreign exchange rates | 7 | 0
Tax effect | 163 | 99
Financial instruments designated as hedging instruments, at fair value, ending balance | (589) | (208)
Foreign currency option |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | 0 | 17
Financial instruments – purchases | 2 | 2
Change in fair value of financial instruments recognized in OCI | 0 | 0
Amount reclassified from OCI to profit or loss | (2) | (26)
Foreign currency revaluation of the net foreign operations | 0 | 0
Effects of changes in foreign exchange rates | 0 | 0
Tax effect | 0 | 7
Financial instruments designated as hedging instruments, at fair value, ending balance | 0 | 0
Cross-currency swaps |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | (776) | 48
Financial instruments – purchases | 161 | 0
Change in fair value of financial instruments recognized in OCI | 2,654 | (2,083)
Amount reclassified from OCI to profit or loss | 1,544 | 1,026
Foreign currency revaluation of the net foreign operations | (3,588) | (176)
Effects of changes in foreign exchange rates | 92 | 30
Tax effect | (254) | 379
Financial instruments designated as hedging instruments, at fair value, ending balance | (167) | (776)
Interest rate swaps |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | (78) | (107)
Financial instruments – purchases | 0 | 0
Change in fair value of financial instruments recognized in OCI | 0 | (37)
Amount reclassified from OCI to profit or loss | 98 | 67
Foreign currency revaluation of the net foreign operations | 0 | 0
Effects of changes in foreign exchange rates | 14 | 9
Tax effect | (33) | (10)
Financial instruments designated as hedging instruments, at fair value, ending balance | 1 | (78)
Treasury Lock contracts |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | 71 | 0
Financial instruments – purchases | 0 | 102
Change in fair value of financial instruments recognized in OCI | 0 | 0
Amount reclassified from OCI to profit or loss | (102) | 0
Foreign currency revaluation of the net foreign operations | 0 | 0
Effects of changes in foreign exchange rates | 0 | 0
Tax effect | 31 | (31)
Financial instruments designated as hedging instruments, at fair value, ending balance | 0 | 71
Commodity Price contracts |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | 23 | (136)
Financial instruments – purchases | 351 | 29
Change in fair value of financial instruments recognized in OCI | 9 | 3
Amount reclassified from OCI to profit or loss | (37) | 198
Foreign currency revaluation of the net foreign operations | 0 | 0
Effects of changes in foreign exchange rates | (8) | 3
Tax effect | (108) | (74)
Financial instruments designated as hedging instruments, at fair value, ending balance | 230 | 23
Total holders of the parent |  |
Disclosure of financial assets [line items] |  |
Financial instruments designated as hedging instruments, at fair value, begging balance | (968) | (149)
Financial instruments – purchases | (323) | (134)
Change in fair value of financial instruments recognized in OCI | 2,663 | (2,117)
Amount reclassified from OCI to profit or loss | 1,787 | 1,196
Foreign currency revaluation of the net foreign operations | (3,588) | (176)
Effects of changes in foreign exchange rates | 105 | 42
Tax effect | (201) | 370
Financial instruments designated as hedging instruments, at fair value, ending balance | $ (525) | $ (968)

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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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