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Financial Instruments - Non-Derivative (Details) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents    
Financial Instruments    
Assets $ 38,734,949 $ 47,546,083
Assets at fair value 38,734,949 47,546,083
Temporary investments    
Financial Instruments    
Assets 6,013,678 5,498,219
Assets at fair value 6,013,678 5,498,219
Trade notes and accounts receivable, net    
Financial Instruments    
Assets 24,727,073 24,906,452
Assets at fair value 24,727,073 24,906,452
Warrants issued by UHI    
Financial Instruments    
Assets 36,395,183 38,298,606
Assets at fair value 36,395,183 38,298,606
Warrants issued by UHI | UHI    
Financial Instruments    
Assets 36,395,183 38,298,606
Assets at fair value 36,395,183 38,298,606
Long-term loan and interest receivable from GTAC    
Financial Instruments    
Assets 929,516 881,740
Assets at fair value 937,137 889,054
Long-term loan and interest receivable from GTAC | Grupo de Telecomunicaciones de Alta Capacidad, S.A.P.I. de C.V. ("GTAC")    
Financial Instruments    
Assets 929,516 881,740
Assets at fair value 937,137 889,054
Held-to-maturity investments    
Financial Instruments    
Assets 287,605 335,833
Assets at fair value 284,443 334,807
Available-for-sale investments    
Financial Instruments    
Assets 7,297,577 6,456,392
Assets at fair value 7,297,577 6,456,392
Senior Notes due 2018, 2025, 2032 and 2040    
Financial Instruments    
Liabilities 29,557,650 41,271,200
Liabilities at fair value 36,635,229 45,615,860
Senior Notes due 2045    
Financial Instruments    
Liabilities 19,705,100 20,635,600
Liabilities at fair value 20,068,856 17,713,393
Senior Notes due 2037 and 2043    
Financial Instruments    
Liabilities 11,000,000 11,000,000
Liabilities at fair value 9,171,610 8,744,050
Senior Notes due 2026 and 2046    
Financial Instruments    
Liabilities 23,646,120 24,762,720
Liabilities at fair value 27,294,835 24,810,017
Notes due 2020    
Financial Instruments    
Liabilities 10,000,000 10,000,000
Liabilities at fair value 9,702,300 9,791,680
Notes due 2021    
Financial Instruments    
Liabilities 6,000,000 6,000,000
Liabilities at fair value 6,090,900 5,953,980
Notes due 2022    
Financial Instruments    
Liabilities 5,000,000 5,000,000
Liabilities at fair value 5,063,300 4,942,230
Notes due 2027    
Financial Instruments    
Liabilities 4,500,000  
Liabilities at fair value 4,442,940  
Short and long-term notes payable to Mexican banks    
Financial Instruments    
Liabilities 14,142,027 9,618,686
Liabilities at fair value 13,917,175 9,331,330
Finance lease obligations    
Financial Instruments    
Liabilities 5,622,774 6,391,826
Liabilities at fair value 5,360,933 5,763,903
Other notes payable    
Financial Instruments    
Liabilities 3,684,060 4,853,025
Liabilities at fair value $ 3,319,414 $ 4,143,984