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Consolidated Statements of Comprehensive Income
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
MXN ($)
$ / shares
Dec. 31, 2017
MXN ($)
$ / shares
Operating revenues:        
Service revenues $ 834,365,232 $ 44,275 $ 863,647,642 $ 878,411,323
Sales of equipment 172,982,637 9,179 174,560,039 143,222,212
Operating revenues 1,007,347,869 53,454 1,038,207,681 1,021,633,535
Operating costs and expenses:        
Cost of sales and services 471,736,157 25,032 508,822,430 496,335,746
Commercial, administrative and general expenses 215,993,865 11,461 227,192,478 240,634,431
Other expenses 5,862,102 311 6,923,022 24,345,113
Depreciation and amortization 158,915,210 8,433 155,712,580 160,174,942
Operating costs and expenses 852,507,334 45,237 898,650,510 921,490,232
Operating income 154,840,535 8,217 139,557,171 100,143,303
Interest income 6,284,672 333 10,646,169 2,925,648
Interest expense (37,911,339) (2,012) (31,771,433) (30,300,781)
Foreign currency exchange (loss) gain, net 5,226,071 277 (7,261,956) (13,818,951)
Valuation of derivatives, interest cost from labor obligations and other financial items, net (7,075,342) (375) (10,176,316) (1,943,760)
Equity interest in net result of associated companies (17,609) (1) 267 91,385
Profit before income tax 121,346,988 6,439 100,993,902 57,096,844
Income tax 51,033,533 2,708 46,477,079 24,941,511
Net profit for the year 70,313,455 3,731 54,516,823 32,155,333
Net profit for the year attributable to:        
Equity holders of the parent 67,730,891 3,594 52,566,197 29,325,921
Non-controlling interests 2,582,564 137 1,950,626 2,829,412
Net profit for the year $ 70,313,455 $ 3,731 $ 54,516,823 $ 32,155,333
Basic and diluted earnings per share attributable to equity holders of the parent | (per share) $ 1.03 $ 0.05 $ 0.79 $ 0.44
Net other comprehensive (loss) income that may be reclassified to profit or loss in subsequent years:        
Effect of translation of foreign entities $ (35,536,252) $ (1,886) $ (64,314,032) $ (18,309,877)
Effect of fair value of derivatives, net of deferred taxes       12,292
Items that will not be reclassified to (loss) or profit in subsequent years:        
Re-measurement of defined benefit plan, net of deferred taxes (29,535,672) (1,567) 757,278 (7,046,089)
Unrealized gain (loss) on equity investments at fair value, net of deferred taxes 883,408 47 (3,765,688) 622,424
Total other comprehensive loss items for the year, net of deferred taxes (64,188,516) (3,406) (67,322,442) (24,721,250)
Total comprehensive income (loss) for the year 6,124,939 325 (12,805,619) 7,434,083
Comprehensive income (loss) for the year attributable to:        
Equity holders of the parent 5,450,679 289 (11,770,227) 1,201,698
Non-controlling interests 674,260 36 (1,035,392) 6,232,385
Total comprehensive income (loss) for the year $ 6,124,939 $ 325 $ (12,805,619) $ 7,434,083