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Financial Instruments - Impact of hedging on equity (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   $ 325,751    
Foreign currency revaluation of the net foreign operations $ 53 1,060 $ 991 $ 724
Ending Balance $ 15,442 307,187 325,751  
Total controlling interest [member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   251,989    
Ending Balance   237,743 251,989  
Non-controlling interest [member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   73,762 78,489 86,621
Ending Balance   69,444 73,762 78,489
Impact Of Hedging Instruments [Member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   (3) 945  
Financial instruments – purchases   (2,803) (104)  
Change in fair value of financial instruments recognized in OCI   7,387 (1,591)  
Amount reclassified from OCI to profit or loss   3,670 1,222  
Foreign currency revaluation of the net foreign operations   (3,588) (269)  
Effects of changes in foreign exchange rates   (1,846) 64  
Tax effect   (1,246) (270)  
Ending Balance   1,571 (3) 945
Impact Of Hedging Instruments [Member] | Total controlling interest [member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   534 1,065  
Financial instruments – purchases   (2,632) (33)  
Change in fair value of financial instruments recognized in OCI   5,686 (490)  
Amount reclassified from OCI to profit or loss   2,726 591  
Foreign currency revaluation of the net foreign operations   (3,588) (176)  
Effects of changes in foreign exchange rates   105 42  
Tax effect   (977) (465)  
Ending Balance   1,854 534 1,065
Impact Of Hedging Instruments [Member] | Foreign exchange forward contracts [member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   (156) 53  
Financial instruments – purchases   (840) (244)  
Change in fair value of financial instruments recognized in OCI   (483)    
Amount reclassified from OCI to profit or loss   277 (68)  
Effects of changes in foreign exchange rates   7    
Tax effect   163 103  
Ending Balance   (1,032) (156) 53
Impact Of Hedging Instruments [Member] | Foreign currency option [Member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance     17  
Financial instruments – purchases   2 2  
Amount reclassified from OCI to profit or loss   (2) (26)  
Tax effect     7  
Ending Balance       17
Impact Of Hedging Instruments [Member] | Cross-currency swaps [member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   1,602 1,296  
Financial instruments – purchases   (2,145) 78  
Change in fair value of financial instruments recognized in OCI   6,922 (77)  
Amount reclassified from OCI to profit or loss   2,461 451  
Foreign currency revaluation of the net foreign operations   (3,588) (176)  
Effects of changes in foreign exchange rates   92 30  
Ending Balance   5,344 1,602 1,296
Impact Of Hedging Instruments [Member] | Interest rate swaps [member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   (20) 351  
Change in fair value of financial instruments recognized in OCI   (762) (416)  
Amount reclassified from OCI to profit or loss   129 36  
Effects of changes in foreign exchange rates   14 9  
Ending Balance   (639) (20) 351
Impact Of Hedging Instruments [Member] | Treasury Lock contracts [Member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   71    
Financial instruments – purchases     102  
Amount reclassified from OCI to profit or loss   (102)    
Tax effect   31 (31)  
Ending Balance     71  
Impact Of Hedging Instruments [Member] | Commodity price contracts [Member]        
Disclosure of detailed information about hedged items [line items]        
Beginning 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  
Effects of changes in foreign exchange rates   (8) 3  
Tax effect   (108) (74)  
Ending Balance   230 23 (136)
Impact Of Hedging Instruments [Member] | Non-controlling interest [member]        
Disclosure of detailed information about hedged items [line items]        
Beginning Balance   (537) (120)  
Financial instruments – purchases   (170) (71)  
Change in fair value of financial instruments recognized in OCI   1,425 (1,101)  
Amount reclassified from OCI to profit or loss   943 631  
Foreign currency revaluation of the net foreign operations   (1,893) (93)  
Effects of changes in foreign exchange rates   55 22  
Tax effect   (106) 195  
Ending Balance   $ (283) $ (537) $ (120)