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Financial Instruments - Impact of Hedging On Equity (Details) - MXN ($)
$ in Millions
 12 Months Ended
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)