Fair Value Measurements

6 Months Ended

Jun. 30, 2017

We consider the carrying amounts of cash and cash equivalents and other current assets and current liabilities (not including derivatives and the current portion of long-term debt) to approximate their fair values because of the relatively short period of time between the origination of these instruments and their expected realization or payment. For our financial instruments measured at fair value on a recurring basis, we prioritize the inputs used in measuring fair value according to a three-tier fair value hierarchy defined by GAAP. For a description of the methods and assumptions that we use to a) estimate the fair value; and b) determine the classification according to the fair value hierarchy for each financial instrument, see Note 5, “Fair Value Measurements,” in our 2016 Annual Report on Form 10-K.

Derivative financial instruments include the 1.125% Call Option derivative asset and the 1.125% Conversion Option derivative liability. These derivatives are not actively traded and are valued based on an option pricing model that uses observable and unobservable market data for inputs. Significant market data inputs used to determine fair value as of June 30, 2017 included the price of our common stock, the time to maturity of the derivative instruments, the risk-free interest rate, and the implied volatility of our common stock. As described further in Note 8, “Derivatives,” the 1.125% Call Option asset and the 1.125% Conversion Option liability were designed such that changes in their fair values would offset, with minimal impact to the consolidated statements of operations. Therefore, the sensitivity of changes in the unobservable inputs to the option pricing model for such instruments is mitigated.

The net changes in fair value of Level 3 financial instruments were insignificant to our results of operations for the six months ended June 30, 2017.

Our financial instruments measured at fair value on a recurring basis at June 30, 2017, were as follows:



	Total		Quoted Market Prices (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Corporate debt securities	$	1,386	$	—	$	1,386	$	—
U.S. treasury notes	263		263		—		—
Government-sponsored enterprise securities (GSEs)	241		241		—		—
Municipal securities	140		—		140		—
Asset-backed securities	128		—		128		—
Certificates of deposit	34		—		34		—
Subtotal - current investments	2,192		504		1,688		—
Corporate debt securities	228		—		228		—
U.S. treasury notes	97		97		—		—
Subtotal - current restricted investments	325		97		228		—
1.125% Call Option derivative asset	440		—		—		440
Total assets	$	2,957	$	601	$	1,916	$	440

1.125% Conversion Option derivative liability	$	440	$	—	$	—	$	440
Total liabilities	$	440	$	—	$	—	$	440

Our financial instruments measured at fair value on a recurring basis at December 31, 2016, were as follows:



	Total		Quoted Market Prices (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Corporate debt securities	$	1,179	$	—	$	1,179	$	—
U.S. treasury notes	84		84		—		—
GSEs	231		231		—		—
Municipal securities	142		—		142		—
Asset-backed securities	69		—		69		—
Certificates of deposit	53		—		53		—
Subtotal - current investments	1,758		315		1,443		—
1.125% Call Option derivative asset	267		—		—		267
Total assets	$	2,025	$	315	$	1,443	$	267

1.125% Conversion Option derivative liability	$	267	$	—	$	—	$	267
Total liabilities	$	267	$	—	$	—	$	267

There were no current restricted investments as of December 31, 2016.

Fair Value Measurements – Disclosure Only

The carrying amounts and estimated fair values of our senior notes, which are classified as Level 2 financial instruments, are indicated in the following table.



	June 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In millions)
5.375% Notes	$	692	$	745	$	691	$	714
1.125% Convertible Notes	483		976		471		792
4.875% Notes	325		333		—		—
1.625% Convertible Notes	289		386		284		344
	$	1,789	$	2,440	$	1,446	$	1,850

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details