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Consolidated Statements of Comprehensive Income
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
MXN ($)
$ / shares
Dec. 31, 2018
MXN ($)
$ / shares
Operating revenues:        
Service revenues $ 857,860,234 $ 43,003 $ 834,365,232 $ 863,647,642
Sales of equipment 159,026,296 7,972 172,982,637 174,560,039
Operating revenues 1,016,886,530 50,975 1,007,347,869 1,038,207,681
Operating costs and expenses:        
Cost of sales and services 470,427,476 23,582 471,736,157 508,822,430
Commercial, administrative and general expenses 212,135,830 10,634 215,993,865 227,192,478
Other expenses 4,724,630 237 5,862,102 6,923,022
Depreciation and amortization 164,243,683 8,233 158,915,210 155,712,580
Operating costs and expenses 851,531,619 42,686 852,507,334 898,650,510
Operating income 165,354,911 8,289 154,840,535 139,557,171
Interest income 5,062,036 254 6,284,672 10,646,169
Interest expense (38,661,740) (1,938) (37,911,339) (31,771,433)
Foreign currency exchange (loss) gain, net (65,366,200) (3,277) 5,226,071 (7,261,956)
Valuation of derivatives, interest cost from labor obligations and other financial items, net 1,291,108 65 (7,075,342) (10,176,316)
Equity interest in net result of associated companies (287,006) (14) (17,609) 267
Profit before income tax 67,393,109 3,379 121,346,988 100,993,902
Income tax 16,366,152 820 51,033,533 46,477,079
Net profit for the year 51,026,957 2,559 70,313,455 54,516,823
Net profit for the year attributable to:        
Equity holders of the parent 46,852,605 2,349 67,730,891 52,566,197
Non-controlling interests 4,174,352 210 2,582,564 1,950,626
Net profit for the year $ 51,026,957 $ 2,559 $ 70,313,455 $ 54,516,823
Basic and diluted earnings per share attributable to equity holders of the parent | (per share) $ 0.71 $ 0.04 $ 1.03 $ 0.79
Net other comprehensive loss that may be reclassified to profit or loss in subsequent years:        
Effect of translation of foreign entities $ (11,515,297) $ (579) $ (35,536,252) $ (64,314,032)
Items that will not be reclassified to (loss) or profit in subsequent years:        
Re-measurement of defined benefit plan, net of deferred taxes (10,299,558) (516) (29,535,672) 757,278
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes (1,952,414) (98) 883,408 (3,765,688)
Revaluation surplus, net of deferred taxes 77,230,031 3,871    
Total other comprehensive (loss) income items for the year, net of deferred taxes 53,462,762 2,678 (64,188,516) (67,322,442)
Total comprehensive (loss) income for the year 104,489,719 5,237 6,124,939 (12,805,619)
Comprehensive (loss) income for the year attributable to:        
Equity holders of the parent 86,150,118 4,319 5,450,679 (11,770,227)
Non-controlling interests 18,339,601 918 674,260 (1,035,392)
Total comprehensive (loss) income for the year $ 104,489,719 $ 5,237 $ 6,124,939 $ (12,805,619)