Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2020

Cash and Cash Equivalents [Abstract]

Components of cash and cash equivalents

The following table summarizes the components of our cash and cash equivalents (amounts in millions):

	At December 31,
	2020		2019
Cash	$	268	$	437
Foreign government treasury bills	34		37
Money market funds	8,345		5,320
Cash and cash equivalents	$	8,647	$	5,794