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Cash and Cash Equivalents
12 Months Ended
Dec. 31, 2020
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents Cash and Cash Equivalents
The following table summarizes the components of our cash and cash equivalents (amounts in millions):
 At December 31,
 20202019
Cash$268 $437 
Foreign government treasury bills34 37 
Money market funds8,345 5,320 
Cash and cash equivalents$8,647 $5,794