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Financial Instruments - Impact of hedging on equity (Details)
$ in Millions, $ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     $ 307,187 $ 325,751  
Foreign currency revaluation of the net foreign operations $ 840 $ 17 350 1,060 $ 991
Ending Balance 335,117 $ 16,336 335,117 307,187 325,751
Total controlling interest          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     237,743 251,989  
Ending Balance 262,601   262,601 237,743 251,989
Non-controlling interest          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     69,444 73,762 78,489
Ending Balance 72,516   72,516 69,444 73,762
Impact Of Hedging Instruments          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     1,580 (74)  
Financial instruments - purchases     1,816 (2,465)  
Change in fair value of financial instruments recognized in OCI     5,086 6,208  
Amount reclassified from OCI to profit or loss     (1,883) 2,779  
Foreign currency revaluation of the net foreign operations     (1,490) (4,118)  
Effects of changes in foreign exchange rates     5 121  
Tax effect     (992) (871)  
Ending Balance 4,121   4,121 1,580 (74)
Impact Of Hedging Instruments | Total controlling interest          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     1,854 534  
Financial instruments - purchases     1,274 (2,347)  
Change in fair value of financial instruments recognized in OCI     2,998 4,389  
Amount reclassified from OCI to profit or loss     (1,558) 1,637  
Foreign currency revaluation of the net foreign operations     (654) (1,694)  
Effects of changes in foreign exchange rates     3 50  
Tax effect     (531) (713)  
Ending Balance 3,385   3,385 1,854 534
Impact Of Hedging Instruments | Forward agreements to purchase foreign currency          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     (541) (156)  
Financial instruments - purchases     33 (445)  
Change in fair value of financial instruments recognized in OCI     (13) (223)  
Amount reclassified from OCI to profit or loss     568 117  
Effects of changes in foreign exchange rates     3 3  
Tax effect     (175) 164  
Ending Balance (124)   (124) (541) (156)
Impact Of Hedging Instruments | Options to purchase foreign currency          
Disclosure of detailed information about hedged items [line items]          
Financial instruments - purchases       1  
Amount reclassified from OCI to profit or loss       (1)  
Impact Of Hedging Instruments | Cross-currency swaps          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     2,729 679  
Financial instruments - purchases     1,040 (2,069)  
Change in fair value of financial instruments recognized in OCI     2,036 5,247  
Amount reclassified from OCI to profit or loss     (1,587) 1,540  
Foreign currency revaluation of the net foreign operations     (654) (1,694)  
Effects of changes in foreign exchange rates     4 43  
Tax effect     (165) (1,016)  
Ending Balance 3,403   3,403 2,729 679
Impact Of Hedging Instruments | Interest rate swap          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     (442) (32)  
Change in fair value of financial instruments recognized in OCI     584 (639)  
Amount reclassified from OCI to profit or loss     0 46  
Effects of changes in foreign exchange rates       7  
Tax effect     (175) 176  
Ending Balance (34)   (34) (442) (32)
Impact Of Hedging Instruments | Treasury Lock contracts          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance       34  
Amount reclassified from OCI to profit or loss       (48)  
Tax effect       15  
Ending Balance         34
Impact Of Hedging Instruments | Commodity price contracts          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     109 11  
Financial instruments - purchases     202 166  
Change in fair value of financial instruments recognized in OCI     390 4  
Amount reclassified from OCI to profit or loss     (539) (17)  
Effects of changes in foreign exchange rates     (4) (4)  
Tax effect     (16) (51)  
Ending Balance 141   141 109 11
Impact Of Hedging Instruments | Non-controlling interest          
Disclosure of detailed information about hedged items [line items]          
Beginning Balance     (274) (608)  
Financial instruments - purchases     541 (117)  
Change in fair value of financial instruments recognized in OCI     2,088 1,819  
Amount reclassified from OCI to profit or loss     (325) 1,142  
Foreign currency revaluation of the net foreign operations     (836) (2,424)  
Effects of changes in foreign exchange rates     2 71  
Tax effect     (460) (158)  
Ending Balance $ 736   $ 736 $ (274) $ (608)