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Cash and Cash Equivalents
12 Months Ended
Dec. 31, 2011
Cash and Cash Equivalents  
Cash and Cash Equivalents

4. Cash and Cash Equivalents

The following table summarizes the components of our cash and cash equivalents with original maturities of three months or less at the date of purchase (amounts in millions):

    At December 31, 
    2011 2010 
 Cash $270 $245 
 Time deposits  24  19 
 Money market funds  2,869  2,216 
 U.S. treasuries and/or foreign       
  government bonds  2  332 
 Cash and cash equivalents $3,165 $2,812