Question how Damage Dealt (total or to champs) is calculated.

Just curious, I just got out of a game as Zoe, and I killed someone with a "Max Range" Q, and was just thinking how much dmg it I was accredited to that it did.

Lets just say that champion A has 100 hp, if you were to kill them with a max range Zoe Q (lets just say 1000 dmg) how much dmg would you get accredited for doing? Would it be 100, or 1000?

For Simplicity sake lets ignore magic resist and majic pen. I just want to know if the extra 900 dmg would count towards my total.

I have NOT discovered a bug, but I know in the past with like old Yoric ult (among others) there would be weird bugs where you would get over inflated values. Does anyone know?