Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair value, assets measured on a recurring and/or non-recurring basis

The table below segregates all financial assets that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date (amounts in millions):

				Fair Value Measurements at June 30, 2016 Using
	As of June 30, 2016			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Balance Sheet Classification
Financial Assets:
Recurring fair value measurements:
Money market funds	$	2,071		$	2,071	$	—		$	—	Cash and cash equivalents
Foreign government treasury bills	34			34		—			—		Cash and cash equivalents
Foreign currency forward contracts not designated as hedges	6			—		6			—		Other current assets
Foreign currency forward contracts designated as hedges	5			—		5			—		Other current assets
Auction rate securities (“ARS”)	9			—		—			9		Other assets
Total recurring fair value measurements	$	2,125		$	2,105	$	11		$	9
Financial liabilities:
Foreign currency forward contracts designated as hedges	(4		)	$	—	$	(4	)	$	—	Accrued expenses and other liabilities

				Fair Value Measurements at December 31, 2015 Using
	As of December 31, 2015			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Balance Sheet Classification
Financial Assets:
Recurring fair value measurements:
Money market funds	$	1,613		$	1,613	$	—		$	—	Cash and cash equivalents
Foreign government treasury bills	34			34		—			—		Cash and cash equivalents
Foreign currency forward contracts not designated as hedges	11			—		11			—		Other current assets
ARS	9			—		—			9		Other assets
Total recurring fair value measurements	$	1,667		$	1,647	$	11		$	9
Financial liabilities:
Foreign currency forward contracts designated as hedges	$	(4	)	$	—	$	(4	)	$	—	Accrued expenses and other liabilities