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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements We consider the carrying amounts of 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 as follows: Level 1 — Observable Inputs. Level 1 financial instruments are actively traded and therefore the fair value for these securities is based on quoted market prices for identical securities in active markets. Level 2 — Directly or Indirectly Observable Inputs. Fair value for these investments is determined using a market approach based on quoted prices for similar securities in active markets or quoted prices for identical securities in inactive markets. Level 3 — Unobservable Inputs. Level 3 financial instruments are valued using unobservable inputs that represent management’s best estimate of what market participants would use in pricing the financial instrument at the measurement date. Our Level 3 financial instruments consist primarily of derivative financial instruments. The derivatives 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 December 31, 2018, 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 12, “Derivatives,” the 1.125% Call Option asset and the 1.125% Conversion Option liability were designed such that changes in their fair values 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 years ended December 31, 2018, and 2017. Our financial instruments measured at fair value on a recurring basis at December 31, 2018, were as follows:
| Total |  | Level 1 |  | Level 2 |  | Level 3
| (In millions)
Corporate debt securities | $ | 1,123 |  |  | $ | — |  |  | $ | 1,123 |  |  | $ | — |
U.S. Treasury notes | 181 |  |  | — |  |  | 181 |  |  | — |
Government-sponsored enterprise securities (GSEs) | 163 |  |  | — |  |  | 163 |  |  | — |
Municipal securities | 114 |  |  | — |  |  | 114 |  |  | — |
Asset-backed securities | 82 |  |  | — |  |  | 82 |  |  | — |
Certificates of deposit | 14 |  |  | — |  |  | 14 |  |  | — |
Other | 4 |  |  | — |  |  | 4 |  |  | — |
Subtotal - current investments | 1,681 |  |  | — |  |  | 1,681 |  |  | — |
1.125% Call Option derivative asset | 476 |  |  | — |  |  | — |  |  | 476 |
Total assets | $ | 2,157 |  |  | $ | — |  |  | $ | 1,681 |  |  | $ | 476 |
1.125% Conversion Option derivative liability | $ | 476 |  |  | $ | — |  |  | $ | — |  |  | $ | 476 |
Total liabilities | $ | 476 |  |  | $ | — |  |  | $ | — |  |  | $ | 476 |
Our financial instruments measured at fair value on a recurring basis at December 31, 2017, were as follows:
| Total |  | Level 1 |  | Level 2 |  | Level 3
| (In millions)
Corporate debt securities | $ | 1,588 |  |  | $ | — |  |  | $ | 1,588 |  |  | $ | — |
U.S. Treasury notes | 388 |  |  | — |  |  | 388 |  |  | — |
GSEs | 253 |  |  | — |  |  | 253 |  |  | — |
Municipal securities | 141 |  |  | — |  |  | 141 |  |  | — |
Asset-backed securities | 117 |  |  | — |  |  | 117 |  |  | — |
Certificates of deposit | 37 |  |  | — |  |  | 37 |  |  | — |
Subtotal - current investments | 2,524 |  |  | — |  |  | 2,524 |  |  | — |
Corporate debt securities | 101 |  |  | — |  |  | 101 |  |  | — |
U.S. Treasury notes | 68 |  |  | — |  |  | 68 |  |  | — |
Subtotal - current restricted investments | 169 |  |  | — |  |  | 169 |  |  | — |
1.125% Call Option derivative asset | 522 |  |  | — |  |  | — |  |  | 522 |
Total assets | $ | 3,215 |  |  | $ | — |  |  | $ | 2,693 |  |  | $ | 522 |
1.125% Conversion Option derivative liability | $ | 522 |  |  | $ | — |  |  | $ | — |  |  | $ | 522 |
Total liabilities | $ | 522 |  |  | $ | — |  |  | $ | — |  |  | $ | 522 |
Fair Value Measurements – Disclosure Only The carrying amounts and estimated fair values of our senior notes are classified as Level 2 financial instruments. Fair value for these securities is determined using a market approach based on quoted market prices for similar securities in active markets or quoted prices for identical securities in inactive markets.
| December 31, 2018 |  | December 31, 2017
| Carrying |  | Fair Value |  | Carrying |  | Fair Value
| Amount |  |  | Amount |
| (In millions)
5.375% Notes | $ | 694 |  |  | $ | 674 |  |  | $ | 692 |  |  | $ | 730 |
4.875% Notes | 326 |  |  | 301 |  |  | 325 |  |  | 329 |
1.125% Convertible Notes (1),(2) | 240 |  |  | 732 |  |  | 496 |  |  | 1,052 |
Credit Facility (2) | — |  |  | — |  |  | 300 |  |  | 300 |
1.625% Convertible Notes (2) | — |  |  | — |  |  | 157 |  |  | 220 |
| $ | 1,260 |  |  | $ | 1,707 |  |  | $ | 1,970 |  |  | $ | 2,631 |
_______________________________
(1) | The fair value of the 1.125% Conversion Option derivative liability (the embedded cash conversion option), which is included in the fair value amounts presented above, amounted to $476 million and $522 million as of December 31, 2018 and 2017, respectively. See further discussion at Note 11, “Debt,” and Note 12, “Derivatives.”
(2) | For more information on debt repayments in the year ended December 31, 2018, refer to Note 11, “Debt.”

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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