The gross unrealized losses on our marketable securities were $357 million and $289 million as of December 31, 2018 and 2017, respectively. The gross unrealized gains for both periods were not significant. a. What does Facebook report as (in millions): 1. Cash equivalents at December 31, 2018? $ 2. Marketable securities at December 31, 2018? $ b. What is the chief difference between Cash equivalents and Marketable securities? Cash equivalents have remaining maturity of Marketable securities have maturity c. What is the cost of its marketable securities (in millions)? Hint: Consider that its marketable securities are in a loss position. + Cash equivalents: Description Money market funds U.S. government securities U.S. government agency securities Certificate of deposits and time deposits Corporate debt securities Marketable securities: Fair Value Measurement at Reporting Date Using Quoted Prices in Active Markets for Identical Asset (Level 1) U.S. government securities U.S. government agency securities Corporate debt securities Total cash equivalents and marketable securities Dec. 31, 2018 $6,792 90 54 369 1 13,836 8,333 8,926 $38,401 $6,792 90 54 13,836 8,333 $29,105 Significant Significant Other Observable Inputs Nonobservable Inputs (Level 2) (Level 3) 369 1 8,926 $9,296 $.