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Financial Risk Management - Liquidity Risk (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of nature and extent of risks arising from financial instruments        
Cash and cash equivalents $ 38,734,949 $ 47,546,083 $ 49,397,126 $ 29,729,350
Temporary investments 6,013,678 5,498,219    
Debt 123,550,897 128,288,206    
Finance lease obligations 5,622,774 6,391,826    
Derivative financial instruments (interest rate swaps)   5,508    
Other notes payable 3,684,060 4,853,025    
Trade and other liabilities 36,323,495 40,635,907    
Interest on debt 126,611,733 132,446,963    
Interest on finance lease obligations 2,125,513 2,650,931    
Interest on other notes payable 124,335 253,225    
2018        
Disclosure of nature and extent of risks arising from financial instruments        
Debt 307,489 851,659    
Finance lease obligations 580,884 575,576    
Other notes payable 1,178,435 1,202,344    
Trade and other liabilities 28,103,281 31,260,457    
Interest on debt 6,848,965 6,610,591    
Interest on finance lease obligations 420,572 454,950    
Interest on other notes payable 5,585 127,656    
12-36 Months        
Disclosure of nature and extent of risks arising from financial instruments        
Debt 11,481,645 12,239,445    
Finance lease obligations 1,158,144 1,145,475    
Derivative financial instruments (interest rate swaps)   5,508    
Other notes payable 2,505,625 2,433,493    
Trade and other liabilities 5,527,223 5,079,927    
Interest on debt 16,946,850 15,606,658    
Interest on finance lease obligations 671,660 768,813    
Interest on other notes payable 41,562 119,632    
36-60 Months        
Disclosure of nature and extent of risks arising from financial instruments        
Debt 19,852,893 18,484,978    
Finance lease obligations 1,002,726 1,128,587    
Other notes payable   1,217,188    
Trade and other liabilities 1,912,825 2,859,396    
Interest on debt 13,910,021 13,876,591    
Interest on finance lease obligations 496,371 622,667    
Interest on other notes payable 77,188 5,937    
Thereafter        
Disclosure of nature and extent of risks arising from financial instruments        
Debt 91,908,870 96,712,124    
Finance lease obligations 2,881,020 3,542,188    
Trade and other liabilities 780,166 1,436,127    
Interest on debt 88,905,897 96,353,123    
Interest on finance lease obligations $ 536,910 $ 804,501