Hello Rafael Andres Martinez Jimene,
The 'idle' process is the percentage of time the CPU is not working, active, or being used.
It is normal for this task to have the highest percentage of time associated with it.
It is similar to the 'System Idle Process' on the Microsoft Windows Operating System.
If you run the command 'show system utilization cpu' it will show the total process utilization not including the 'idle' process.
If there are times when the 'show system utilization cpu' results show 95% you would then want to run the 'show system utilization process' command and see which non-idle process or processes are running high.
Thank you.