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Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments | The following tables summarize our investments as of the dates indicated:
| September 30, 2021
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Value
|  | Gains |  | Losses |
| (In millions)
Corporate debt securities | $ | 1,688 |  |  | $ | 19 |  |  | $ | 2 |  |  | $ | 1,705 |
Mortgage-backed securities | 607 |  |  | 4 |  |  | 1 |  |  | 610 |
U.S. Treasury notes | 235 |  |  | — |  |  | — |  |  | 235 |
Asset-backed securities | 223 |  |  | 1 |  |  | — |  |  | 224 |
Municipal securities | 96 |  |  | 1 |  |  | — |  |  | 97 |
Other | 29 |  |  | — |  |  | — |  |  | 29 |
Total | $ | 2,878 |  |  | $ | 25 |  |  | $ | 3 |  |  | $ | 2,900 |
| December 31, 2020
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Value
|  | Gains |  | Losses |
| (In millions)
Corporate debt securities | $ | 1,220 |  |  | $ | 36 |  |  | $ | — |  |  | $ | 1,256 |
Mortgage-backed securities | 383 |  |  | 10 |  |  | 1 |  |  | 392 |
U.S. Treasury notes | 27 |  |  | — |  |  | — |  |  | 27 |
Asset-backed securities | 130 |  |  | 2 |  |  | — |  |  | 132 |
Municipal securities | 66 |  |  | 2 |  |  | — |  |  | 68 |
Total | $ | 1,826 |  |  | $ | 50 |  |  | $ | 1 |  |  | $ | 1,875 |
Contractual maturities of investments | The contractual maturities of our available-for-sale investments as of September 30, 2021 are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 555 |  |  | $ | 557 |
Due after one year through five years | 1,530 |  |  | 1,546 |
Due after five years through ten years | 296 |  |  | 298 |
Due after ten years | 497 |  |  | 499 |
Total | $ | 2,878 |  |  | $ | 2,900 |
Available-for-sale investments | The following table summarizes those available-for-sale investments that have been in a continuous loss position for less than 12 months. No investments have been in a continuous loss position for 12 months or more as of September 30, 2021, and December 31, 2020.
| September 30, 2021 |  | December 31, 2020
| 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 |  |  | $ | 2 |  |  | 174 |  |  | $ | — |  |  | $ | — |  |  | — |
Mortgage-backed securities | 270 |  |  | 1 |  |  | 94 |  |  | 77 |  |  | 1 |  |  | 21 |
Total | $ | 779 |  |  | $ | 3 |  |  | 268 |  |  | $ | 77 |  |  | $ | 1 |  |  | 21 |

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