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Bank Loans and Notes Payable - Rollforward, Liabilities Arising from Financing Activities (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance $ 172,630 $ 178,884  
Cash Flows 56,283 (16,869)  
Non-cash flows, Acquisition 1,765 4,104  
Non-cash flows, New leases 7,982 7,490  
Non-cash flows, Foreign Exchange movement 4,450 (1,651)  
Non-cash flows, Others 3,863 672  
Ending balance 246,972 172,630 $ 178,884
Total Liabilities From Financing Activities [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 117,951 128,664 131,348
Cash Flows 66,093 (8,021) (1,027)
Non-cash flows, Acquisition   1,917 1,147
Non-cash flows, Foreign Exchange movement 5,034 (1,641) (362)
Non-cash flows, Others (413) (2,968) (2,442)
Ending balance 188,664 117,951 128,664
Bank loans, short-term      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 20,807 22,944 13,669
Cash Flows (1,286) (2,999) 8,313
Non-cash flows, Acquisition   1,917 1,147
Non-cash flows, Foreign Exchange movement 221 (397) 417
Non-cash flows, Others (312) (658) (602)
Ending balance 19,430 20,807 22,944
Notes payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 97,144 105,720  
Cash Flows 67,380 (5,022)  
Non-cash flows, Foreign Exchange movement 4,813 (1,244)  
Non-cash flows, Others (101) (2,310)  
Ending balance 169,235 97,144 105,720
Notes Payable Excluding Financing Lease Liabilities [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   105,628 117,551
Cash Flows     (9,314)
Non-cash flows, Foreign Exchange movement     (769)
Non-cash flows, Others     (1,840)
Ending balance     105,628
Financing Lease Liabilities [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 54,679 50,220  
Cash Flows   (8,848)  
Non-cash flows, Acquisition   2,187  
Non-cash flows, New leases   7,490  
Non-cash flows, Foreign Exchange movement   (10)  
Non-cash flows, Others   3,640  
Ending balance   54,679 50,220
Financial leases [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 54,679 92 128
Cash Flows (9,810) (8,848) (26)
Non-cash flows, Acquisition 1,765    
Non-cash flows, New leases 7,982    
Non-cash flows, Foreign Exchange movement (584)   (10)
Non-cash flows, Others 4,276    
Ending balance $ 58,308 $ 54,679 $ 92