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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - summary of Net profit for the year from discontinued operations (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Operating revenues:        
Service revenues $ 714,244,392 $ 34,700 $ 708,483,701 [1] $ 702,961,964 [1]
Sales of equipment 141,290,479 6,864 131,223,459 [1] 148,521,512 [1]
Operating revenues 855,534,871 41,564 839,707,160 [1] 851,483,476 [1]
Total costs and expenses 341,059,662 16,570 334,881,859 [1] 348,776,249 [1]
Operating income 166,132,641 8,070 145,503,379 [1] 143,798,284 [1]
Profit before income tax 102,760,165 4,992 47,543,602 [1] 110,382,620 [1]
Tax expense:        
Net profit for the year from discontinued operations 121,710,718 $ 5,913 16,992,625 [1] 9,844,889 [1]
Discontinued operations [member] | Tracfone Wireless Inc Tracfone [member]        
Operating revenues:        
Service revenues 130,091,540   149,376,532 131,403,268
Sales of equipment 22,160,481   27,802,837 24,461,125
Operating revenues 152,252,021   177,179,369 155,864,393
Total costs and expenses 134,495,316   157,327,836 144,822,141
Operating income 17,756,705   19,851,533 11,042,252
Financial cost (1,733)   (2,026) (77,884)
Gain on disposal of discontinued operations 132,821,709   0 0
Profit before income tax 150,576,681   19,849,507 10,964,368
Tax expense:        
Related to pre-tax profit from the ordinary activities for the period 2,571,541   2,856,882 1,119,479
Related to gain on disposal from discontinued operations 26,294,422   0 0
Net profit for the year from discontinued operations $ 121,710,718   $ 16,992,625 $ 9,844,889
[1] Restated for discontinued operations.