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Financial Risk Management - Cash Flow Interest Rate Risk (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Temporary investments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets   $ 30,992
Assets at fair value   30,992
Warrants issued by UHI    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of 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    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 872,317 817,605
Assets at fair value 875,585 824,540
Increase (Decrease) of Fair Value Over Carrying Value of assets 3,268 6,935
Open Ended Fund    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 4,688,202 7,662,726
Assets at fair value 4,688,202 7,662,726
Other Equity Instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 5,751,001 6,545,625
Assets at fair value 5,751,001 6,545,625
Other Financial Assets    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets   72,612
Assets at fair value   72,612
Derivative financial instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 4,592 1,035,522
Assets at fair value 4,592 1,035,522
Senior Notes Due 2049    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 14,162,850  
Liabilities at fair value 15,364,426  
Notes due 2021    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   6,000,000
Liabilities at fair value   5,956,506
Notes due 2022    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   5,000,000
Liabilities at fair value   4,941,430
Notes due 2027    
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 4,656,375 4,027,275
Other notes payable    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 1,324,063 2,576,874
Liabilities at fair value 1,295,780 2,430,667
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 3,377,545 3,492,153
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 90,827 89,389
Interest rate risk | Open Ended Fund    
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 468,820 766,273
Interest rate risk | Other Equity Instruments    
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 575,100 654,563
Interest rate risk | Other Financial Assets    
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   7,261
U.S. dollar | 6.625% Senior Notes due 2025    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 11,330,280 11,803,800
Liabilities at fair value 13,243,624 12,970,370
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 1,913,344 1,166,570
U.S. dollar | 4.625% Senior Notes due 2026    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,665,140 5,901,900
Liabilities at fair value 6,079,885 5,849,137
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 414,745 (52,763)
U.S. dollar | 8.50% Senior Notes due 2032    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,665,140 5,901,900
Liabilities at fair value 7,571,346 7,405,822
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 1,906,206 1,503,922
U.S. dollar | 6.625% Senior Notes due 2040    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 11,330,280 11,803,800
Liabilities at fair value 14,139,283 12,733,821
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 2,809,003 930,021
U.S. dollar | 5% Senior Notes due 2045    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 18,883,800 19,673,000
Liabilities at fair value 19,739,047 17,317,748
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 855,247 (2,355,252)
U.S. dollar | 6.125% Senior Notes due 2046    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 16,995,420 17,705,700
Liabilities at fair value 20,565,308 18,201,991
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 3,569,888 496,291
U.S. dollar | Senior Notes Due 2049    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 14,162,850  
Liabilities at fair value 15,364,426  
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 1,201,576  
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 3,237,706 2,463,607
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 1,022,734 532,151
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 2,663,341 2,244,504
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 4,222,931 2,203,403
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 2,829,152 (623,477)
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 5,626,419 2,316,490
U.S. dollar | Interest rate risk | Senior Notes Due 2049    
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 2,738,019  
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
Liabilities at fair value   9,605,700
Increase (Decrease) of Fair Value Over Carrying Value of liabilities   (394,300)
Mexican peso | Notes due 2021    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   6,000,000
Liabilities at fair value   5,956,506
Increase (Decrease) of Fair Value Over Carrying Value of liabilities   (43,494)
Mexican peso | Notes due 2022    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   5,000,000
Liabilities at fair value   4,941,430
Increase (Decrease) of Fair Value Over Carrying Value of liabilities   (58,570)
Mexican peso | Notes due 2027    
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 4,656,375 4,027,275
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 156,375 (472,725)
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 4,133,385 3,586,050
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (366,615) (913,950)
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 4,853,485 4,319,575
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (1,646,515) (2,180,425)
Mexican peso | Notes payable to Mexican banks    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 22,845,382 13,834,538
Liabilities at fair value 23,012,707 13,551,620
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 167,325 (282,918)
Mexican peso | Lease liabilities    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 9,363,520 5,317,944
Liabilities at fair value 9,120,903 5,121,534
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (242,617) (196,410)
Mexican peso | Other notes payable    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 1,324,063 2,576,874
Liabilities at fair value 1,295,780 2,430,667
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (28,283) (146,207)
Mexican peso | Derivative financial instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 915,290 148,061
Liabilities at fair value 915,290 148,061
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   566,270
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   552,157
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   435,573
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 622,013 (69,998)
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 46,724 (555,345)
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 (1,161,167) (1,748,468)
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 2,468,596 1,072,243
Mexican peso | Interest rate risk | Lease liabilities    
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 669,473 315,743
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 $ 101,295 $ 96,860