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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, 2021
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure Right of use Assets and Lease liabilities [Line Items]        
As of January 1 $ 101,976,844   $ 118,003,223  
As of January 1 101,976,844   118,003,223 $ 120,078,302
Additions and release 4,680,419   7,569,964 8,015,051
Business Combinations       9,668,507
Modifications 12,968,719   6,572,362 9,492,280
Depreciation (26,551,232)   (28,371,085) (23,593,566)
Translation adjustment (2,702,357)   (1,797,620) (5,657,351)
Balance at December 31 90,372,393 $ 4,391 101,976,844 118,003,223
Interest expense 7,301,216   9,134,288 7,940,240
Payments (30,544,750) $ (1,484) (29,623,565) [1] (26,765,075) [1]
Balance at December 31 98,654,225      
Towers and sites [member]        
Disclosure Right of use Assets and Lease liabilities [Line Items]        
As of January 1 85,218,875   96,102,449 94,252,098
Additions and release 3,145,941   5,745,869 6,364,508
Business Combinations       9,668,507
Modifications 10,945,985   8,559,335 7,474,469
Depreciation (20,699,207)   (22,064,413) (17,286,497)
Translation adjustment (2,054,566)   (3,124,365) (4,370,636)
Balance at December 31 76,557,028   85,218,875 96,102,449
Property [member]        
Disclosure Right of use Assets and Lease liabilities [Line Items]        
As of January 1 12,205,435   17,439,370 21,075,884
Additions and release 482,456   309,576 921,542
Modifications 1,024,573   (3,035,831) 1,288,974
Depreciation (3,221,499)   (3,440,428) (4,941,222)
Translation adjustment (554,260)   932,748 (905,808)
Balance at December 31 9,936,705   12,205,435 17,439,370
Office equipment [member]        
Disclosure Right of use Assets and Lease liabilities [Line Items]        
As of January 1 4,552,534   4,461,404 4,750,320
Additions and release 1,052,022   1,514,519 729,001
Modifications 998,161   1,048,858 728,837
Depreciation (2,630,526)   (2,866,244) (1,365,847)
Translation adjustment (93,531)   393,997 (380,907)
Balance at December 31 3,878,660   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 1 109,327,241   120,596,733 119,387,660
Additions and release 3,060,042   4,833,959 7,437,621
Business Combinations       10,810,111
Modifications 12,535,394   7,769,326 8,363,045
Interest expense 7,301,216   9,134,288 7,940,240
Payments (30,544,750)   (29,623,565) (26,765,075)
Translation adjustment (3,024,918)   (3,383,500) (6,576,869)
Balance at December 31 $ 98,654,225   $ 109,327,241 $ 120,596,733
[1] Restated for discontinued operations.