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Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments | The following tables summarize our investments as of the dates indicated:
| June 30, 2018
| Amortized |  | Gross Unrealized |  | Estimated Fair
| Cost |  | Gains |  | Losses |  | Value
| (In millions)
Corporate debt securities | $ | 1,390 |  |  | $ | — |  |  | $ | 8 |  |  | $ | 1,382 |
U.S. treasury notes | 331 |  |  | — |  |  | 1 |  |  | 330 |
GSEs | 209 |  |  | — |  |  | 2 |  |  | 207 |
Municipal securities | 138 |  |  | — |  |  | 2 |  |  | 136 |
Asset backed securities | 100 |  |  | — |  |  | 1 |  |  | 99 |
Certificates of deposit | 19 |  |  | — |  |  | — |  |  | 19 |
Other | 3 |  |  | — |  |  | — |  |  | 3 |
Subtotal - current investments | 2,190 |  |  | — |  |  | 14 |  |  | 2,176 |
Corporate debt securities | 55 |  |  | — |  |  | — |  |  | 55 |
U.S. treasury notes | 25 |  |  | — |  |  | — |  |  | 25 |
Subtotal - current restricted investments | 80 |  |  | — |  |  | — |  |  | 80 |
| $ | 2,270 |  |  | $ | — |  |  | $ | 14 |  |  | $ | 2,256 |
| 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 | June 30, 2018, and mature in one year or less. The contractual maturities of our available-for-sale investments as of June 30, 2018 are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 1,356 |  |  | $ | 1,354 |
Due after one year through five years | 914 |  |  | 902 |
| $ | 2,270 |  |  | $ | 2,256 |
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 June 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 | $ | 959 |  |  | $ | 7 |  |  | 535 |  |  | $ | 116 |  |  | $ | 1 |  |  | 72 |
U.S. Treasury notes | 224 |  |  | 1 |  |  | 52 |  |  | — |  |  | — |  |  | — |
GSEs | — |  |  | — |  |  | — |  |  | 113 |  |  | 2 |  |  | 56 |
Municipal securities | 81 |  |  | 1 |  |  | 79 |  |  | 40 |  |  | 1 |  |  | 52 |
Asset backed securities | 90 |  |  | 1 |  |  | 59 |  |  | — |  |  | — |  |  | — |
| $ | 1,354 |  |  | $ | 10 |  |  | 725 |  |  | $ | 269 |  |  | $ | 4 |  |  | 180 |
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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