What did the US lose after Pearl Harbor?

I'm assuming you mean what long-term materiel losses resulted from the attack. While the US Army Air Corps lost hundreds of planes, these were fairly easily replaced. The US Navy had 18 ships either sunk or damaged during the attack. Of those, only 3 never saw any action again. The USS Arizona and USS Utah still lay on the bottom of the harbor. The USS Oklahoma capsized during the attack, was refloated, and was being towed to San Francisco when is sank during a storm. All other ships were back in action by the end of the war.