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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2017
Fair Value Disclosures [Abstract] |
Fair value of assets measured on recurring basis | Our financial instruments measured at fair value on a recurring basis at March 31, 2017, were as follows:
| Total |  | Level 1 |  | Level 2 |  | Level 3
| (In millions)
Corporate debt securities | $ | 1,353 |  |  | $ | — |  |  | $ | 1,353 |  |  | $ | — |
Government-sponsored enterprise securities (GSEs) | 209 |  |  | 209 |  |  | — |  |  | — |
U.S. treasury notes | 193 |  |  | 193 |  |  | — |  |  | — |
Municipal securities | 152 |  |  | — |  |  | 152 |  |  | — |
Asset-backed securities | 110 |  |  | — |  |  | 110 |  |  | — |
Certificates of deposit | 39 |  |  | — |  |  | 39 |  |  | — |
Subtotal - current investments | 2,056 |  |  | 402 |  |  | 1,654 |  |  | — |
1.125% Call Option derivative asset | 181 |  |  | — |  |  | — |  |  | 181 |
Total assets measured at fair value on a recurring basis | $ | 2,237 |  |  | $ | 402 |  |  | $ | 1,654 |  |  | $ | 181 |
1.125% Conversion Option derivative liability | $ | 181 |  |  | $ | — |  |  | $ | — |  |  | $ | 181 |
Total liabilities measured at fair value on a recurring basis | $ | 181 |  |  | $ | — |  |  | $ | — |  |  | $ | 181 |
Our financial instruments measured at fair value on a recurring basis at December 31, 2016, were as follows:
| Total |  | Level 1 |  | Level 2 |  | Level 3
| (In millions)
Corporate debt securities | $ | 1,179 |  |  | $ | — |  |  | $ | 1,179 |  |  | $ | — |
GSEs | 231 |  |  | 231 |  |  | — |  |  | — |
U.S. treasury notes | 84 |  |  | 84 |  |  | — |  |  | — |
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 measured at fair value on a recurring basis | $ | 2,025 |  |  | $ | 315 |  |  | $ | 1,443 |  |  | $ | 267 |
1.125% Conversion Option derivative liability | $ | 267 |  |  | $ | — |  |  | $ | — |  |  | $ | 267 |
Total liabilities measured at fair value on a recurring basis | $ | 267 |  |  | $ | — |  |  | $ | — |  |  | $ | 267 |
Schedule of fair value, asset and liabilities measured on recurring basis - 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.
| March 31, 2017 |  | December 31, 2016
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
| (In millions)
5.375% Notes | $ | 691 |  |  | $ | 726 |  |  | $ | 691 |  |  | $ | 714 |
1.125% Convertible Notes | 477 |  |  | 705 |  |  | 471 |  |  | 792 |
1.625% Convertible Notes | 287 |  |  | 321 |  |  | 284 |  |  | 344 |
| $ | 1,455 |  |  | $ | 1,752 |  |  | $ | 1,446 |  |  | $ | 1,850 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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