Marriott International Inc Chief executive Arne Sorenson will testify before a U.S. Senate panel Thursday about a hacking incident it reported in December that exposed the records of up to 383 million customers in its Starwood hotels reservation system and 5.25 million passport numbers. The Senate's Permanent Subcommittee on Investigations is holding a hearing "to examine the causes and scope of private sector data breaches that expose the most sensitive information of millions of Americans."