Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016		2015
Cash	$	286	$	176
Foreign government treasury bills	38		34
Money market funds	2,921		1,613
Cash and cash equivalents	$	3,245	$	1,823