Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Investments All Other Investments [Abstract]

Schedule of Cash, Cash Equivalents and Marketable Securities

The following tables show our cash and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short and long-term marketable securities as of December 31, 2014 and December 31, 2013 (in millions):

	December 31, 2014
									Cash and		Short-Term		Long-Term
	Amortized		Unrealized		Unrealized		Fair		Cash		Marketable		Marketable
	Cost		Gains		Losses		Value		Equivalents		Securities		Securities
Cash	$	447	$	—	$	—	$	447	$	447	$	—	$	—
Level 1:
Money market funds		8		—		—		8		8		—		—
Level 2:
U.S. agency securities		38		—		—		38		—		35		3
Certificates of deposit		8		—		—		8		—		8		—
Commercial paper		1		—		—		1		—		1		—
Corporate debt securities		92		—		—		92		—		64		28
Subtotal		139		—		—		139		—		108		31
Total	$	594	$	—	$	—	$	594	$	455	$	108	$	31

	December 31, 2013
									Cash and		Short-Term		Long-Term
	Amortized		Unrealized		Unrealized		Fair		Cash		Marketable		Marketable
	Cost		Gains		Losses		Value		Equivalents		Securities		Securities
Cash	$	195	$	—	$	—	$	195	$	195	$	—	$	—
Level 1:
Money market funds		156		—		—		156		156		—		—
Level 2:
U.S. agency securities		37		—		—		37		—		14		23
Certificates of deposit		23		—		—		23		—		16		7
Commercial paper		5		—		—		5		—		5		—
Corporate debt securities		254		—		—		254		—		96		158
Subtotal		319		—		—		319		—		131		188
Total	$	670	$	—	$	—	$	670	$	351	$	131	$	188

Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments

The following table shows the notional principal amounts of our outstanding derivative instruments that are not designated as hedging instruments for the periods presented:

	December 31, 2014		December 31, 2013
	(in millions)
Foreign exchange-forward contracts (1)(2)	$	20	$	5

(1) Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. Dollar.

(2) The fair value of our derivatives are not material for all periods presented and are reported as liabilities in accrued and other current liabilities on our consolidated balance sheets. We measure the fair value of our outstanding or unsettled derivatives using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.