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Right-of-use assets and lease debt - Summary of lease cost recognized expenses (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement [line items]      
Depreciation expense of right-of-use assets $ 26,551,232 $ 28,371,085 $ 23,593,566
Interest expense on lease liabilities 7,301,216 9,134,288 7,940,240
Expense relating to short-term leases 29,833 32,238 1,980,361
Expense relating to leases of low-value assets 685 2,883 25,935
Variable lease payments 68,236 78,494 1,299,502
Total 33,951,202 37,618,988 34,839,604
Other [Member]      
Statement [line items]      
Depreciation expense of right-of-use assets 19,932,316 22,404,924 18,176,521
Interest expense on lease liabilities 6,212,774 7,081,693 5,654,721
Expense relating to short-term leases 29,833 32,238 1,978,403
Expense relating to leases of low-value assets 685 2,883 25,935
Variable lease payments 68,236 78,494 1,299,502
Total 26,243,844 29,600,232 27,135,082
Related Party [Member]      
Statement [line items]      
Depreciation expense of right-of-use assets 6,618,916 5,966,161 5,417,045
Interest expense on lease liabilities 1,088,442 2,052,595 2,285,519
Expense relating to short-term leases     1,958
Total $ 7,707,358 $ 8,018,756 $ 7,704,522