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Financial Instruments - Non-Derivative (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Cash and Cash Equivalents    
Financial Instruments    
Assets $ 29,058,093 $ 27,452,265
Assets at fair value 29,058,093 27,452,265
Trade notes and accounts receivable, net    
Financial Instruments    
Assets 12,343,797 14,486,184
Assets at fair value 12,343,797 14,486,184
Warrants issued by UHI    
Financial Instruments    
Assets   33,775,451
Assets at fair value   33,775,451
Warrants issued by UHI | UHI    
Financial Instruments    
Assets   33,775,451
Assets at fair value   33,775,451
Long-term loan and interest receivable from GTAC    
Financial Instruments    
Assets 821,253 872,317
Assets at fair value 824,092 875,585
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 821,253 872,317
Assets at fair value 824,092 875,585
Open Ended Fund    
Financial Instruments    
Assets 1,135,803 4,688,202
Assets at fair value 1,135,803 4,688,202
Other Equity Instruments    
Financial Instruments    
Assets 5,397,504 5,751,001
Assets at fair value 5,397,504 5,751,001
Senior Notes due 2025, 2032 and 2040    
Financial Instruments    
Liabilities 29,923,950 28,325,700
Liabilities at fair value 40,584,237 34,954,254
Senior Notes due 2045    
Financial Instruments    
Liabilities 19,949,300 18,883,800
Liabilities at fair value 24,282,886 19,739,047
Senior Notes due 2037 and 2043    
Financial Instruments    
Liabilities 11,000,000 11,000,000
Liabilities at fair value 9,238,435 8,986,870
Senior Notes due 2026 and 2046    
Financial Instruments    
Liabilities 23,939,160 22,660,560
Liabilities at fair value 31,811,792 26,645,193
Senior Notes Due 2049    
Financial Instruments    
Liabilities 14,961,975 14,162,850
Liabilities at fair value 18,978,667 15,364,426
Notes due 2027    
Financial Instruments    
Liabilities 4,500,000 4,500,000
Liabilities at fair value 5,035,860 4,656,375
Long-term notes payable to Mexican banks    
Financial Instruments    
Liabilities 19,602,893 22,845,382
Liabilities at fair value 19,801,142 23,012,707
Lease liabilities    
Financial Instruments    
Liabilities 9,292,351 9,363,520
Liabilities at fair value $ 9,343,100 9,120,903
Other notes payable    
Financial Instruments    
Liabilities   1,324,063
Liabilities at fair value   $ 1,295,780