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Investments (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments | The following tables summarize our investments as of the dates indicated:
| September 30, 2018
| Amortized |  | Gross Unrealized |  | Estimated Fair
| Cost |  | Gains |  | Losses |  | Value
| (In millions)
Corporate debt securities | $ | 1,197 |  |  | $ | 1 |  |  | $ | 7 |  |  | $ | 1,191 |
U.S. treasury notes | 222 |  |  | — |  |  | 1 |  |  | 221 |
GSEs | 172 |  |  | — |  |  | 2 |  |  | 170 |
Municipal securities | 121 |  |  | — |  |  | 2 |  |  | 119 |
Asset backed securities | 93 |  |  | — |  |  | 1 |  |  | 92 |
Certificates of deposit | 15 |  |  | — |  |  | — |  |  | 15 |
Other | 4 |  |  | — |  |  | — |  |  | 4 |
| $ | 1,824 |  |  | $ | 1 |  |  | $ | 13 |  |  | $ | 1,812 |
| December 31, 2017
| Amortized |  | Gross Unrealized |  | Estimated Fair
| Cost |  | Gains |  | Losses |  | Value
| (In millions)
Corporate debt securities | $ | 1,591 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 1,588 |
U.S. treasury notes | 389 |  |  | — |  |  | 1 |  |  | 388 |
GSEs | 255 |  |  | — |  |  | 2 |  |  | 253 |
Municipal securities | 142 |  |  | — |  |  | 1 |  |  | 141 |
Asset-backed securities | 117 |  |  | — |  |  | — |  |  | 117 |
Certificates of deposit | 37 |  |  | — |  |  | — |  |  | 37 |
Subtotal - current investments | 2,531 |  |  | 1 |  |  | 8 |  |  | 2,524 |
Corporate debt securities | 101 |  |  | — |  |  | — |  |  | 101 |
U.S. treasury notes | 68 |  |  | — |  |  | — |  |  | 68 |
Subtotal - current restricted investments | 169 |  |  | — |  |  | — |  |  | 169 |
| $ | 2,700 |  |  | $ | 1 |  |  | $ | 8 |  |  | $ | 2,693 |
Contractual maturities of investments | ur held-to-maturity restricted investments are carried at amortized cost, which approximates fair value. Held-to-maturity restricted investments as of September 30, 2018, are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 111 |  |  | $ | 111 |
Due after one year through five years | 7 |  |  | 7 |
| $ | 118 |  |  | $ | 118 |
The contractual maturities of our available-for-sale investments as of September 30, 2018 are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 1,025 |  |  | $ | 1,023 |
Due after one year through five years | 799 |  |  | 789 |
| $ | 1,824 |  |  | $ | 1,812 |
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 continuous loss position for 12 months or more as of September 30, 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 | $ | 727 |  |  | $ | 4 |  |  | 460 |  |  | $ | 186 |  |  | $ | 3 |  |  | 127 |
U.S. Treasury notes | — |  |  | — |  |  | — |  |  | 94 |  |  | 1 |  |  | 31 |
GSEs | — |  |  | — |  |  | — |  |  | 127 |  |  | 2 |  |  | 68 |
Municipal securities | 63 |  |  | 1 |  |  | 63 |  |  | 55 |  |  | 1 |  |  | 57 |
Asset backed securities | 72 |  |  | 1 |  |  | 41 |  |  | — |  |  | — |  |  | — |
| $ | 862 |  |  | $ | 6 |  |  | 564 |  |  | $ | 462 |  |  | $ | 7 |  |  | 283 |
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, 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 | $ | 1,297 |  |  | $ | 3 |  |  | 561 |  |  | $ | 94 |  |  | $ | 1 |  |  | 69 |
U.S. Treasury Notes | 470 |  |  | 1 |  |  | 89 |  |  | — |  |  | — |  |  | — |
GSEs | 173 |  |  | 1 |  |  | 69 |  |  | 95 |  |  | 1 |  |  | 47 |
Municipal securities | — |  |  | — |  |  | — |  |  | 38 |  |  | 1 |  |  | 48 |
| $ | 1,940 |  |  | $ | 5 |  |  | 719 |  |  | $ | 227 |  |  | $ | 3 |  |  | 164 |

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