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Bank Loans and Notes Payables - Summary of Reconciliation of Liabilities Arising From Financing Activities (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   $ 71,360 $ 83,603  
Cash flows, Repayments $ (2,272) (45,187) (20,460) [2] $ (15,957)
Repayments of borrowings and lease liabilities   (45,760) (20,952)  
Cash flows, Proceeds $ 3,132 62,297 10,736 [2] 15,426
Non-cash impact , New leases   599 215  
Non-cash Impacts, Others   34 (21)  
Non-cash Impacts, Foreign Exchange movements   1,005 (1,627)  
Non-cash Impacts, Translation Effect   (750) (594)  
Carrying value   88,784 71,360 83,603
Long-term lease liabilities        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Non-cash Impacts, Others     0  
Short-term Borrowings        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   882 1,382  
Cash flows, Repayments   (17,641) (852)  
Cash flows, Proceeds   18,525 503  
Non-cash impact , New leases   0 0  
Non-cash Impacts, Others   0 0  
Non-cash Impacts, Foreign Exchange movements   0 0  
Non-cash Impacts, Translation Effect   (121) (151)  
Carrying value   1,645 882 1,382
Short-term Borrowings | Short-term bank loans        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   882 1,382  
Cash flows, Repayments   (17,641) (852)  
Cash flows, Proceeds   18,525 503  
Non-cash impact , New leases   0 0  
Non-cash Impacts, Others   0 0  
Non-cash Impacts, Foreign Exchange movements   0 0  
Non-cash Impacts, Translation Effect   (121) (151)  
Carrying value   1,645 882 1,382
Short-term Borrowings | Short-term notes payable        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   0 0  
Cash flows, Repayments   0 0  
Cash flows, Proceeds   0 0  
Non-cash impact , New leases   0 0  
Non-cash Impacts, Others   0 0  
Non-cash Impacts, Foreign Exchange movements   0 0  
Non-cash Impacts, Translation Effect   0  
Carrying value   0 0 0
Long-term Borrowings        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   69,095 80,423  
Cash flows, Repayments   (27,546) (19,608)  
Cash flows, Proceeds   43,772 10,233  
Non-cash impact , New leases   0 0  
Non-cash Impacts, Others   0 0  
Non-cash Impacts, Foreign Exchange movements   1,018 (1,590)  
Non-cash Impacts, Translation Effect   (506) (363)  
Carrying value   85,833 69,095 80,423
Long-term Borrowings | Long-term bank loans        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   11,576 16,572  
Cash flows, Repayments   (896) (14,926)  
Cash flows, Proceeds   293 10,233  
Non-cash impact , New leases   0 0  
Non-cash Impacts, Others   0 0  
Non-cash Impacts, Foreign Exchange movements   0 0  
Non-cash Impacts, Translation Effect   (405) (303)  
Carrying value   10,568 11,576 16,572
Long-term Borrowings | Long-term notes payable        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   57,519 63,841  
Cash flows, Repayments   (26,650) (4,674)  
Cash flows, Proceeds   43,479 0  
Non-cash impact , New leases   0 0  
Non-cash Impacts, Others   0 0  
Non-cash Impacts, Foreign Exchange movements   1,018 (1,589)  
Non-cash Impacts, Translation Effect   (101) (59)  
Carrying value   75,265 57,519 63,841
Long-term Borrowings | Long-term lease liabilities        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   0 10  
Cash flows, Repayments     (8)  
Cash flows, Proceeds     0  
Non-cash impact , New leases     0  
Non-cash Impacts, Foreign Exchange movements     (1)  
Non-cash Impacts, Translation Effect     (1)  
Carrying value     0 10
Lease liabilities        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value   1,383 1,798  
Payments of lease liabilities, classified as financing activities   (573) (492)  
Cash flows, Proceeds   0 0  
Non-cash impact , New leases   599 215  
Non-cash Impacts, Others   34 (21)  
Non-cash Impacts, Foreign Exchange movements   (13) (37)  
Non-cash Impacts, Translation Effect   (123) (80)  
Carrying value   $ 1,306 $ 1,383 $ 1,798
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18