Detainee Treatment Accountability Act - Directs the Secretary of Defense to transmit a copy of any confidential or exclusive report provided to the Department of Defense (DOD) by an entity outside the U.S. government concerning treatment of DOD detainees held at any location in connection with an armed conflict, including the war on terror, within 15 days of receipt to: (1) the Committee on Armed Services and the Committee on Foreign Relations of the Senate; and (2) the Committee on Armed Services and the Committee on International Relations of the House of Representatives.