Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019		2018
Cash	$	437	$	268
Foreign government treasury bills	37		32
Money market funds	5,320		3,925
Cash and cash equivalents	$	5,794	$	4,225