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Leases - Lease liabilities (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure Of Leases Line Items [Line Items]      
Total undiscounted lease liabilities   $ 88,594 $ 86,854
Total lease liabilities   58,308 54,679
Current $ 340 6,772 7,387
Non-Current $ 2,591 51,536 47,292
0-1 year [member]      
Disclosure Of Leases Line Items [Line Items]      
Total undiscounted lease liabilities   11,511 10,655
1-5 years [member]      
Disclosure Of Leases Line Items [Line Items]      
Total undiscounted lease liabilities   36,172 40,262
Later than five years and not later than ten years [member]      
Disclosure Of Leases Line Items [Line Items]      
Total undiscounted lease liabilities   27,088 24,053
Later than 10 years [member]      
Disclosure Of Leases Line Items [Line Items]      
Total undiscounted lease liabilities   $ 13,823 $ 11,884