text: Our cash, cash equivalents and investments classified by security type as of September 30, 2024 and December 31, 2023 
  consisted of the following (in millions): 
  
  September 30, 2024 
  
  Gross 
  Unrealized 
  Gains  Gross 
  Unrealized 
  Losses  Cash and 
  Cash 
  Equivalents  Short-Term 
  Investments  Adjusted Cost  Fair Value 
  
  Cash  $  13,784  $  — $  — $  13,784  $  13,784  $  — 
  
  Certificates of deposit and time deposits  10,327  2  —  10,329  600  9,729 
  
  Commercial paper  4,160  3  (1)  4,162  945  3,217 
  
  U.S. government securities  3,391  3  (1)  3,393  998  2,395 
  
  Corporate debt securities  195  1  —  196  —  196 
  
  1,784  —  —  1,784  1,784  —  Money market funds 
  
  Total cash, cash equivalents and short- 
  term investments 
  $  33,641  $  9  $  (2) $  33,648  $  18,111 $  15,537 