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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Lawsuits Disputes

Subject

    31 December 2018
Anticipated Maximum
Risk
(excluding accrued
interest)		      31 December 2017
Anticipated Maximum
Risk
(excluding accrued
interest)		      31 December 2018
Provision		      31 December 2017
Provision		  

Disputes related with ICTA

      13,367        13,367        —          —