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Cash and cash equivalents: (Tables)
 12 Months Ended
Dec. 31, 2020
Cash and cash equivalents:  
Schedule of cash and cash equivalents

 

 

 

 

 

 

 

 

 

 

December 31, 

 

    

2019

    

2020

 

 

 

 

 

 

 

Cash and cash held at banks

 

Ps.

3,642,037

 

Ps.

3,514,293

Short term investments

 

 

2,550,642

 

 

1,678,335

 

 

 

 

 

 

 

Total cash and cash equivalents

 

Ps.

6,192,679

 

Ps.

5,192,628