The National Security Agency spying scandal could cost the top U.S. tech companies billions of dollars over the next several years, according to industry experts. In addition to consumer Internet companies, hardware and cloud-storage giants like IBM, Hewlett-Packard, and Oracle could suffer billions of dollars in losses if international clients take their business elsewhere. Now, the nation's largest Internet companies are calling for Congress and President Obama to reform the U.S. government's secret surveillance programs.