"By damage, if you mean the attack outside of Gotham, than yea, verily. I am proud to admit to the destruction and confusion I wrought there."
Watching the lost expression of Billy trying to internalize what was being told him, was amusing to Loki, and made him smile. The question actually made him laugh.
"Why? Is that not obvious? I am Loki! And I do as I want! And for now, it pleases me to speak unto thee the truth."
What he would not reveal was how the above mentioned attack had gone awry for him, and that he was currently in a SHIELD cell, awaiting time when he would be returned to Asgard to be punished by Odin. Chances are that if he went to speak with Wanda again, she would tell him, anyway.