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Right of use assets and lease debt - Schedule of detailed information about right-of-use assets and lease liabilities (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Disclosure Right of use Assets and Lease liabilities [Line Items]      
As of January 1 $ 118,003,223    
As of January 1 118,003,223   $ 120,078,302
Additions and release 7,569,964   8,015,051
Business Combinations     9,668,507
Modifications 6,572,362   9,492,280
Depreciation (28,371,085)   (23,593,566)
Translation adjustment (1,797,620)   (5,657,351)
Balance at December 31 101,976,844 $ 5,112 118,003,223
Interest expense 9,134,288   7,940,240
Payments (29,623,565) $ (1,485) (26,765,075)
Balance at December 31 109,327,241    
Towers and sites [member]      
Disclosure Right of use Assets and Lease liabilities [Line Items]      
As of January 1 96,102,449   94,252,098
Additions and release 5,745,869   6,364,508
Business Combinations     9,668,507
Modifications 8,559,335   7,474,469
Depreciation (22,064,413)   (17,286,497)
Translation adjustment (3,124,365)   (4,370,636)
Balance at December 31 85,218,875   96,102,449
Property [member]      
Disclosure Right of use Assets and Lease liabilities [Line Items]      
As of January 1 17,439,370   21,075,884
Additions and release 309,576   921,542
Modifications (3,035,831)   1,288,974
Depreciation (3,440,428)   (4,941,222)
Translation adjustment 932,748   (905,808)
Balance at December 31 12,205,435   17,439,370
Office equipment [member]      
Disclosure Right of use Assets and Lease liabilities [Line Items]      
As of January 1 4,461,404   4,750,320
Additions and release 1,514,519   729,001
Modifications 1,048,858   728,837
Depreciation (2,866,244)   (1,365,847)
Translation adjustment 393,997   (380,907)
Balance at December 31 4,552,534   4,461,404
Liability related to right-of-use of assets [member]      
Disclosure Right of use Assets and Lease liabilities [Line Items]      
As of January 1 120,596,733   119,387,660
Additions and release 4,833,959   7,437,621
Business Combinations     10,810,111
Modifications 7,769,326   8,363,045
Interest expense 9,134,288   7,940,240
Payments (29,623,565)   (26,765,075)
Translation adjustment (3,383,500)   (6,576,869)
Balance at December 31 $ 109,327,241   $ 120,596,733