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Financial Instruments - Non-Derivative (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents    
Financial Instruments    
Assets $ 27,451,997 $ 32,068,291
Assets at fair value 27,451,997 32,068,291
Temporary investments    
Financial Instruments    
Assets   30,992
Assets at fair value   30,992
Trade notes and accounts receivable, net    
Financial Instruments    
Assets 14,486,184 19,748,850
Assets at fair value 14,486,184 19,748,850
Warrants issued by UHI    
Financial Instruments    
Assets 33,775,451 34,921,530
Assets at fair value 33,775,451 34,921,530
Warrants issued by UHI | UHI    
Financial Instruments    
Assets 33,775,451 34,921,530
Assets at fair value 33,775,451 34,921,530
Long-term loan and interest receivable from GTAC    
Financial Instruments    
Assets 872,317 817,605
Assets at fair value 875,585 824,540
Long-term loan and interest receivable from GTAC | Grupo de Telecomunicaciones de Alta Capacidad, S.A.P.I. de C.V. and subsidiaries ("GTAC")    
Financial Instruments    
Assets 872,317 817,605
Assets at fair value 875,585 824,540
Open Ended Fund    
Financial Instruments    
Assets 4,688,202 7,662,726
Assets at fair value 4,688,202 7,662,726
Other Equity Instruments    
Financial Instruments    
Assets 5,751,001 6,545,625
Assets at fair value 5,751,001 6,545,625
Other Financial Assets    
Financial Instruments    
Assets   72,612
Assets at fair value   72,612
Senior Notes due 2025, 2032 and 2040    
Financial Instruments    
Liabilities 28,325,700 29,509,500
Liabilities at fair value 34,954,254 33,110,013
Senior Notes due 2045    
Financial Instruments    
Liabilities 18,883,800 19,673,000
Liabilities at fair value 19,739,047 17,317,748
Senior Notes due 2037 and 2043    
Financial Instruments    
Liabilities 11,000,000 11,000,000
Liabilities at fair value 8,986,870 7,905,625
Senior Notes due 2026 and 2046    
Financial Instruments    
Liabilities 22,660,560 23,607,600
Liabilities at fair value 26,645,193 24,051,128
Senior Notes Due 2049    
Financial Instruments    
Liabilities 14,162,850  
Liabilities at fair value 15,364,426  
Notes due 2020    
Financial Instruments    
Liabilities   10,000,000
Liabilities at fair value   9,605,700
Notes due 2021    
Financial Instruments    
Liabilities   6,000,000
Liabilities at fair value   5,956,506
Notes due 2022    
Financial Instruments    
Liabilities   5,000,000
Liabilities at fair value   4,941,430
Notes due 2027    
Financial Instruments    
Liabilities 4,500,000 4,500,000
Liabilities at fair value 4,656,375 4,027,275
Short and long-term notes payable to Mexican banks    
Financial Instruments    
Liabilities 22,845,382 13,834,538
Liabilities at fair value 23,012,707 13,551,620
Lease liabilities    
Financial Instruments    
Liabilities 9,363,520 5,317,944
Liabilities at fair value 9,120,903 5,121,534
Other notes payable    
Financial Instruments    
Liabilities 1,324,063 2,576,874
Liabilities at fair value $ 1,295,780 $ 2,430,667