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Financial Risk Management - Cash Flow Interest Rate Risk (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Warrants issued by UHI    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets   $ 33,775,451
Assets at fair value   33,775,451
Long-term loan and interest receivable from GTAC    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets $ 821,253 872,317
Assets at fair value 824,092 875,585
Increase (Decrease) of Fair Value Over Carrying Value of assets 2,839 3,268
Open Ended Fund    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 1,135,803 4,688,202
Assets at fair value 1,135,803 4,688,202
Other Equity Instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets 5,397,504 5,751,001
Assets at fair value 5,397,504 5,751,001
6.625% Senior Notes due 2025    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   11,330,280
Liabilities at fair value   13,243,624
Increase (Decrease) of Fair Value Over Carrying Value of liabilities   1,913,344
4.625% Senior Notes due 2026    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   5,665,140
Liabilities at fair value   6,079,885
Increase (Decrease) of Fair Value Over Carrying Value of liabilities   414,745
Senior Notes Due 2049    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 14,961,975 14,162,850
Liabilities at fair value 18,978,667 15,364,426
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 5,035,860 4,656,375
Long-term notes payable to Mexican banks    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 19,602,893 22,845,382
Liabilities at fair value 19,801,142 23,012,707
Other notes payable    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   1,324,063
Liabilities at fair value   1,295,780
Derivative financial instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of assets   4,592
Assets at fair value   4,592
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 85,248 90,827
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
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
U.S. dollar | 6.625% Senior Notes due 2025    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 11,969,580  
Liabilities at fair value 14,609,830  
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 2,640,250  
U.S. dollar | 4.625% Senior Notes due 2026    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,984,790  
Liabilities at fair value 6,840,854  
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 856,064  
U.S. dollar | 8.50% Senior Notes due 2032    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 5,984,790 5,665,140
Liabilities at fair value 9,193,415 7,571,346
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 3,208,625 1,906,206
U.S. dollar | 6.625% Senior Notes due 2040    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 11,969,580 11,330,280
Liabilities at fair value 16,780,992 14,139,283
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 4,811,412 2,809,003
U.S. dollar | 5% Senior Notes due 2045    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 19,949,300 18,883,800
Liabilities at fair value 24,282,886 19,739,047
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 4,333,586 855,247
U.S. dollar | 6.125% Senior Notes due 2046    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 17,954,370 16,995,420
Liabilities at fair value 24,970,938 20,565,308
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 7,016,568 3,569,888
U.S. dollar | Senior Notes Due 2049    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 14,961,975 14,162,850
Liabilities at fair value 18,978,667 15,364,426
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 4,016,692 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 4,101,233  
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 1,540,149  
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 4,127,967 2,663,341
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 6,489,511 4,222,931
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 6,761,875 2,829,152
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 9,513,662 5,626,419
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 5,914,559 2,738,019
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 5,035,860 4,656,375
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 535,860 156,375
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 4,087,575 4,133,385
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (412,425) (366,615)
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 5,150,860 4,853,485
Increase (Decrease) of Fair Value Over Carrying Value of liabilities (1,349,140) (1,646,515)
Mexican peso | Long-term notes payable to Mexican banks    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 19,602,893 22,845,382
Liabilities at fair value 19,801,142 23,012,707
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 198,249 167,325
Mexican peso | Lease liabilities    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 9,292,351 9,363,520
Liabilities at fair value 9,343,100 9,120,903
Increase (Decrease) of Fair Value Over Carrying Value of liabilities 50,749 (242,617)
Mexican peso | Other notes payable    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities   1,324,063
Liabilities at fair value   1,295,780
Increase (Decrease) of Fair Value Over Carrying Value of liabilities   (28,283)
Mexican peso | Derivative financial instruments    
Disclosure of nature and extent of risks arising from financial instruments    
Carrying value of liabilities 3,476,223 915,290
Liabilities at fair value 3,476,223 915,290
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 1,039,446 622,013
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 (3,668) 46,724
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 (834,054) (1,161,167)
Mexican peso | Interest rate risk | Long-term 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 2,178,363 2,468,596
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 $ 985,059 669,473
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