The Iraq War has cost the US nearly $2 TRILLION

(From Military Times)

Even if the U.S. administration decided to leave — or was evicted from — Iraq immediately, the bill of war to the U.S. to date would be an estimated $1.922 trillion in current dollars.
This figure includes not only funding appropriated to the Pentagon explicitly for the war, but spending on Iraq by the State Department, the care of Iraq War veterans and interest on debt incurred to fund 16 years of U.S. military involvement in the country.

Reprinted from: https://www.ac2news.com/2020/02/the-iraq-war-has-cost-the-us-nearly-2-trillion/