Animation speed.

How i can change animation speed of “idle” to 0.5x here if I use character motor?

if (grounded) {

if (Input.GetKey("a")) 
    { 
    player.animation.Play("walk"); 
    } 
    else if (Input.GetKey("d")) 
    { 
    player.animation.Play("walk"); 
    } 
    else 
    { 
    player.animation.Play("idle"); 
    } 
    
    velocity.y = Mathf.Min(velocity.y, 0);

}

animation[“Animation name”].speed = 0.5;

I believe that is how.