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Financial Risk Management - Cash Flow Interest Rate Risk (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Temporary investments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets $ 6,013,678 $ 5,498,219
Assets at fair value 6,013,678 5,498,219
Warrants issued by UHI    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of 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    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 929,516 881,740
Assets at fair value 937,137 889,054
Increase (Decrease) of Fair Value Over Carrying Value of assets 7,621 7,314
Held-to-maturity investments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 287,605 335,833
Assets at fair value 284,443 334,807
Increase (Decrease) of Fair Value Over Carrying Value of assets (3,162) (1,026)
Available-for-sale investments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 7,297,577 6,456,392
Assets at fair value 7,297,577 6,456,392
Derivative financial instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 2,263,874 647,770
Assets at fair value 2,263,874 647,770
Notes due 2021    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 6,000,000 6,000,000
Liabilities at fair value 6,090,900 5,953,980
Notes due 2022    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,000,000 5,000,000
Liabilities at fair value 5,063,300 4,942,230
Notes due 2027    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 4,500,000  
Liabilities at fair value 4,442,940  
Finance lease obligations    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,622,774 6,391,826
Liabilities at fair value 5,360,933 5,763,903
Other notes payable    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 3,684,060 4,853,025
Liabilities at fair value 3,319,414 4,143,984
Interest rate risk | Warrants issued by UHI    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value 3,639,518 3,829,861
Interest rate risk | Long-term loan and interest receivable from GTAC    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value 101,335 96,219
Interest rate risk | Held-to-maturity investments    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value 25,282 32,455
Interest rate risk | Available-for-sale investments    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value 729,758 645,639
U.S. dollar | 6% Senior Notes due 2018    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   10,317,800
Liabilities at fair value   10,858,040
Increase (Decrease) of Fair Value Over Carrying Value of liabilities   540,240
U.S. dollar | 6.625% Senior Notes due 2025    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 11,823,060 12,381,360
Liabilities at fair value 14,065,776 14,151,151
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 2,242,716 1,769,791
U.S. dollar | 4.625% Senior Notes due 2026    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,911,530 6,190,680
Liabilities at fair value 6,278,104 6,229,991
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 366,574 39,311
U.S. dollar | 8.50% Senior Notes due 2032    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,911,530 6,190,680
Liabilities at fair value 7,985,945 7,566,868
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 2,074,415 1,376,188
U.S. dollar | 6.625% Senior Notes due 2040    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 11,823,060 12,381,360
Liabilities at fair value 14,583,508 13,039,801
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 2,760,448 658,441
U.S. dollar | 5% Senior Notes due 2045    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 19,705,100 20,635,600
Liabilities at fair value 20,068,856 17,713,393
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 363,756 (2,922,207)
U.S. dollar | 6.125% Senior Notes due 2046    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 17,734,590 18,572,040
Liabilities at fair value 21,016,731 18,580,026
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 3,282,141 7,986
U.S. dollar | Interest rate risk | 6% Senior Notes due 2018    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value   1,626,044
U.S. dollar | Interest rate risk | 6.625% Senior Notes due 2025    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 3,649,294 3,184,906
U.S. dollar | Interest rate risk | 4.625% Senior Notes due 2026    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 994,384 662,310
U.S. dollar | Interest rate risk | 8.50% Senior Notes due 2032    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 2,873,010 2,132,875
U.S. dollar | Interest rate risk | 6.625% Senior Notes due 2040    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 4,218,799 1,962,421
U.S. dollar | Interest rate risk | 5% Senior Notes due 2045    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 2,370,642 (1,150,868)
U.S. dollar | Interest rate risk | 6.125% Senior Notes due 2046    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 5,383,814 1,865,989
Mexican peso | 7.38% Notes due 2020    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 10,000,000 10,000,000
Liabilities at fair value 9,702,300 9,791,680
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (297,700) (208,320)
Mexican peso | Notes due 2021    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 6,000,000 6,000,000
Liabilities at fair value 6,090,900 5,953,980
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 90,900 (46,020)
Mexican peso | Notes due 2022    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,000,000 5,000,000
Liabilities at fair value 5,063,300 4,942,230
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 63,300 (57,770)
Mexican peso | Notes due 2027    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 4,500,000  
Liabilities at fair value 4,442,940  
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (57,060)  
Mexican peso | 8.49% Senior Notes due 2037    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 4,500,000 4,500,000
Liabilities at fair value 4,085,685 4,031,550
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (414,315) (468,450)
Mexican peso | 7.25% Senior Notes due 2043    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 6,500,000 6,500,000
Liabilities at fair value 5,085,925 4,712,500
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (1,414,075) (1,787,500)
Mexican peso | Notes payable to Mexican banks    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 14,142,027 9,618,686
Liabilities at fair value 13,917,175 9,331,330
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (224,852) (287,356)
Mexican peso | Finance lease obligations    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,622,774 6,391,826
Liabilities at fair value 5,360,933 5,763,903
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (261,841) (627,923)
Mexican peso | Other notes payable    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 3,684,060 4,853,025
Liabilities at fair value 3,319,414 4,143,984
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (364,646) (709,041)
Mexican peso | Derivative financial instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   5,508
Liabilities at fair value   5,508
Mexican peso | Interest rate risk | 7.38% Notes due 2020    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 672,530 770,848
Mexican peso | Interest rate risk | Notes due 2021    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 699,990 549,378
Mexican peso | Interest rate risk | Notes due 2022    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 569,630 436,453
Mexican peso | Interest rate risk | Notes due 2027    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 387,234  
Mexican peso | Interest rate risk | 8.49% Senior Notes due 2037    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value (5,746) (65,295)
Mexican peso | Interest rate risk | 7.25% Senior Notes due 2043    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value (905,482) (1,316,250)
Mexican peso | Interest rate risk | Notes payable to Mexican banks    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 1,166,866 645,777
Mexican peso | Interest rate risk | Finance lease obligations    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value 274,252 (51,533)
Mexican peso | Interest rate risk | Other notes payable    
Disclosure of nature and extent of risks arising from financial instruments    
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value $ (32,705) $ (294,643)