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Investments (Tables) | 3 Months Ended
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Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Investments | The following tables summarize our investments as of the dates indicated:
| March 31, 2017
| Amortized |  | Gross Unrealized |  | Estimated Fair
| Cost |  | Gains |  | Losses |  | Value
| (In millions)
Corporate debt securities | $ | 1,354 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1,353 |
GSEs | 210 |  |  | — |  |  | 1 |  |  | 209 |
U.S. treasury notes | 193 |  |  | — |  |  | — |  |  | 193 |
Municipal securities | 153 |  |  | — |  |  | 1 |  |  | 152 |
Asset-backed securities | 110 |  |  | — |  |  | — |  |  | 110 |
Certificates of deposit | 39 |  |  | — |  |  | — |  |  | 39 |
| $ | 2,059 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 2,056 |
| December 31, 2016
| Amortized |  | Gross Unrealized |  | Estimated Fair
| Cost |  | Gains |  | Losses |  | Value
| (In millions)
Corporate debt securities | $ | 1,180 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1,179 |
GSEs | 232 |  |  | — |  |  | 1 |  |  | 231 |
U.S. treasury notes | 84 |  |  | — |  |  | — |  |  | 84 |
Municipal securities | 143 |  |  | — |  |  | 1 |  |  | 142 |
Asset-backed securities | 69 |  |  | — |  |  | — |  |  | 69 |
Certificates of deposit | 53 |  |  | — |  |  | — |  |  | 53 |
| $ | 1,761 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 1,758 |
Contractual maturities of investments | The contractual maturities of our investments as of March 31, 2017 are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 1,151 |  |  | $ | 1,151 |
Due after one year through five years | 872 |  |  | 870 |
Due after five years through ten years | 36 |  |  | 35 |
| $ | 2,059 |  |  | $ | 2,056 |
The contractual maturities of our restricted investments, which are designated as held-to-maturity and are carried at amortized cost, which approximates fair value, as of March 31, 2017 are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 97 |  |  | $ | 97 |
Due after one year through five years | 18 |  |  | 18 |
| $ | 115 |  |  | $ | 115 |
Schedule of available for sale securities continuous unrealized loss position | 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 loss position for 12 months or more as of March 31, 2017:
| 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 | $ | 570 |  |  | $ | 2 |  |  | 341 |  |  | $ | — |  |  | $ | — |  |  | — |
GSEs | 200 |  |  | 1 |  |  | 83 |  |  | — |  |  | — |  |  | — |
Municipal securities | 84 |  |  | 1 |  |  | 101 |  |  | — |  |  | — |  |  | — |
| $ | 854 |  |  | $ | 4 |  |  | 525 |  |  | $ | — |  |  | $ | — |  |  | — |
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 loss position for 12 months or more as of December 31, 2016:
| 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 | $ | 542 |  |  | $ | 2 |  |  | 378 |  |  | $ | — |  |  | $ | — |  |  | — |
GSEs | 198 |  |  | 1 |  |  | 73 |  |  | — |  |  | — |  |  | — |
Municipal securities | 101 |  |  | 1 |  |  | 129 |  |  | — |  |  | — |  |  | — |
| $ | 841 |  |  | $ | 4 |  |  | 580 |  |  | $ | — |  |  | $ | — |  |  | — |

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