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Cash and cash equivalents: (Tables)
 12 Months Ended
Dec. 31, 2018
Cash and cash equivalents [abstract]  
Disclosure of detailed information about cash and cash equivalents [text block]
 
 
December 31,
 
 
 
 
 
 
 
 
 
 
2017
 
 
2018
 
 
 
 
 
 
 
 
Cash and cash held at banks
 
Ps
4,417,791
 
 
Ps
3,713,072
 
Short-term investments
 
 
240,701
 
 
 
841,295
 
Fiduciary rights
(*)
 
 
18,962
 
 
 
30,140
 
 
 
 
 
 
 
 
 
 
Total cash and cash equivalents
 
Ps
4,677,454
 
 
Ps
4,584,507
 
 
(*)
Corresponds to the fiduciary’s agreement 2875 of Airplan, Company’s subsidiary, signed with Fiduciaria Bancolombia to administer the resources of the concession contract. See Notes 8.2 and 18.5.