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Investments (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Investments | The following table segregates those available-for-sale investments that have been in a continuous loss position for less than 12 months, and those that have been in a continuous loss position for 12 months or more as of March 31, 2019:
| In a Continuous Loss Position for Less than 12 Months |  | In a Continuous Loss Position for 12 Months or More
| Estimated Fair Value |  | Unrealized Losses |  | Total Number of Positions |  | Estimated Fair Value |  | Unrealized Losses |  | Total Number of Positions
| (Dollars in millions)
Corporate debt securities | $ | 207 |  |  | $ | 1 |  |  | 96 |  |  | $ | 403 |  |  | $ | 2 |  |  | 280 |
GSEs | — |  |  | — |  |  | — |  |  | 122 |  |  | 1 |  |  | 71 |
Municipal securities | — |  |  | — |  |  | — |  |  | 87 |  |  | 1 |  |  | 91 |
| $ | 207 |  |  | $ | 1 |  |  | 96 |  |  | $ | 612 |  |  | $ | 4 |  |  | 442 |
The following table segregates those available-for-sale investments that have been in a continuous loss position for less than 12 months, and those that have been in a continuous loss position for 12 months or more as of December 31, 2018:
| In a Continuous Loss Position for Less than 12 Months |  | In a Continuous Loss Position for 12 Months or More
| Estimated Fair Value |  | Unrealized Losses |  | Total Number of Positions |  | Estimated Fair Value |  | Unrealized Losses |  | Total Number of Positions
| (Dollars in millions)
Corporate debt securities | $ | 509 |  |  | $ | 3 |  |  | 285 |  |  | $ | 412 |  |  | $ | 5 |  |  | 298 |
GSEs | — |  |  | — |  |  | — |  |  | 127 |  |  | 1 |  |  | 76 |
Municipal securities | — |  |  | — |  |  | — |  |  | 87 |  |  | 1 |  |  | 90 |
Asset-backed securities | — |  |  | — |  |  | — |  |  | 68 |  |  | 1 |  |  | 52 |
| $ | 509 |  |  | $ | 3 |  |  | 285 |  |  | $ | 694 |  |  | $ | 8 |  |  | 516 |
The following tables summarize our investments as of the dates indicated:
| March 31, 2019
| Amortized |  | Gross Unrealized |  | Estimated Fair
| Cost |  | Gains |  | Losses |  | Value
| (In millions)
Corporate debt securities | $ | 949 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 947 |
U.S. Treasury notes | 168 |  |  | — |  |  | — |  |  | 168 |
GSEs | 167 |  |  | — |  |  | 1 |  |  | 166 |
Municipal securities | 113 |  |  | — |  |  | 1 |  |  | 112 |
Asset-backed securities | 75 |  |  | — |  |  | — |  |  | 75 |
Mortgage-backed securities | 23 |  |  | — |  |  | — |  |  | 23 |
Certificates of deposit | 14 |  |  | — |  |  | — |  |  | 14 |
Other | 3 |  |  | — |  |  | — |  |  | 3 |
| $ | 1,512 |  |  | $ | 1 |  |  | $ | 5 |  |  | $ | 1,508 |
| December 31, 2018
| Amortized |  | Gross Unrealized |  | Estimated Fair
| Cost |  | Gains |  | Losses |  | Value
| (In millions)
Corporate debt securities | $ | 1,131 |  |  | $ | — |  |  | $ | 8 |  |  | $ | 1,123 |
U.S. Treasury notes | 181 |  |  | — |  |  | — |  |  | 181 |
GSEs | 164 |  |  | — |  |  | 1 |  |  | 163 |
Municipal securities | 115 |  |  | — |  |  | 1 |  |  | 114 |
Asset-backed securities | 83 |  |  | — |  |  | 1 |  |  | 82 |
Certificates of deposit | 14 |  |  | — |  |  | — |  |  | 14 |
Other | 4 |  |  | — |  |  | — |  |  | 4 |
Total current investments | $ | 1,692 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 1,681 |
Contractual maturities of investments | The contractual maturities of our available-for-sale investments as of March 31, 2019 are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 927 |  |  | $ | 926 |
Due after one year through five years | 550 |  |  | 547 |
Due after five years through ten years | 12 |  |  | 12 |
Due after ten years | 23 |  |  | 23 |
| $ | 1,512 |  |  | $ | 1,508 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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