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Investments (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Schedule of investments | The following tables summarize our current investments as of the dates indicated:
| December 31, 2022
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Value
|  | Gains |  | Losses |
| (In millions)
Corporate debt securities | $ | 2,303 |  |  | $ | 2 |  |  | $ | 121 |  |  | $ | 2,184 |
Mortgage-backed securities | 787 |  |  | — |  |  | 56 |  |  | 731 |
Asset-backed securities | 308 |  |  | — |  |  | 20 |  |  | 288 |
Municipal securities | 160 |  |  | — |  |  | 11 |  |  | 149 |
U.S. Treasury notes | 106 |  |  | — |  |  | 1 |  |  | 105 |
Other | 45 |  |  | — |  |  | 3 |  |  | 42 |
Total | $ | 3,709 |  |  | $ | 2 |  |  | $ | 212 |  |  | $ | 3,499 |
| December 31, 2021
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Value
|  | Gains |  | Losses |
| (In millions)
Corporate debt securities | $ | 1,836 |  |  | $ | 9 |  |  | $ | 12 |  |  | $ | 1,833 |
Mortgage-backed securities | 616 |  |  | 2 |  |  | 4 |  |  | 614 |
Asset-backed securities | 248 |  |  | — |  |  | 1 |  |  | 247 |
Municipal securities | 123 |  |  | 1 |  |  | 1 |  |  | 123 |
U.S. Treasury notes | 353 |  |  | — |  |  | — |  |  | 353 |
Other | 32 |  |  | — |  |  | — |  |  | 32 |
Total | $ | 3,208 |  |  | $ | 12 |  |  | $ | 18 |  |  | $ | 3,202 |
Schedule of contractual maturities of investments | The contractual maturities of our current investments as of December 31, 2022 are summarized below:
| Amortized Cost |  | Estimated Fair Value
| (In millions)
Due in one year or less | $ | 318 |  |  | $ | 315 |
Due after one year through five years | 2,249 |  |  | 2,127 |
Due after five years through ten years | 364 |  |  | 345 |
Due after ten years | 778 |  |  | 712 |
Total | $ | 3,709 |  |  | $ | 3,499 |
Schedule of available-for-sale 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 December 31, 2022:
| 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 | $ | 1,124 |  |  | $ | 45 |  |  | 683 |  |  | $ | 887 |  |  | $ | 76 |  |  | 371 |
Mortgage-backed securities | 395 |  |  | 20 |  |  | 220 |  |  | 319 |  |  | 36 |  |  | 131 |
Asset-backed securities | 161 |  |  | 6 |  |  | 108 |  |  | 118 |  |  | 14 |  |  | 59 |
Municipal securities | 75 |  |  | 4 |  |  | 83 |  |  | 57 |  |  | 7 |  |  | 57 |
U.S. Treasury notes | 88 |  |  | 1 |  |  | 6 |  |  | — |  |  | — |  |  | — |
Other | 15 |  |  | 1 |  |  | 16 |  |  | 17 |  |  | 2 |  |  | 6 |
Total | $ | 1,858 |  |  | $ | 77 |  |  | 1,116 |  |  | $ | 1,398 |  |  | $ | 135 |  |  | 624 |
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, 2021:
| 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 | $ | 1,063 |  |  | $ | 12 |  |  | 395 |  |  | $ | — |  |  | $ | — |  |  | — |
Mortgage-backed securities | 408 |  |  | 4 |  |  | 146 |  |  | — |  |  | — |  |  | — |
Asset-backed securities | 166 |  |  | 1 |  |  | 75 |  |  | — |  |  | — |  |  | — |
Municipal securities | 69 |  |  | 1 |  |  | 61 |  |  | — |  |  | — |  |  | — |
Total | $ | 1,706 |  |  | $ | 18 |  |  | 677 |  |  | $ | — |  |  | $ | — |  |  | — |
Schedule of balances of restricted investments | The following table presents the balances of restricted investments:
| December 31,
| 2022 |  | 2021
| (In millions)
Cash and cash equivalents | $ | 42 |  |  | $ | 68 |
U.S. Treasury notes | 159 |  |  | 144 |
Corporate debt securities | 37 |  |  | — |
Total restricted investments | $ | 238 |  |  | $ | 212 |

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