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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2018
Cash And Cash Equivalents [Abstract]  
Summary of Cash and Cash Equivalents

As of December 31, 2016, 2017 and 2018, the balances are comprised of the following:

 

 

 

December 31,

2016

 

 

December 31,

2017

 

 

December 31,

2018

 

Cash

 

Ps.

 

1,560,536

 

 

Ps.

 

1,616,408

 

 

Ps.

 

1,912,047

 

Investments of cash surpluses

 

 

 

3,326,662

 

 

 

 

5,855,824

 

 

 

 

3,894,166

 

Cash equivalents designated for expenditure, held in trust

 

 

 

300,940

 

 

 

 

257,911

 

 

 

 

345,244

 

 

 

Ps.

 

5,188,138

 

 

Ps.

 

7,730,143

 

 

Ps.

 

6,151,457