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Investments of Insurance Subsidiaries (Tables) | 9 Months Ended
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Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | A summary of our insurance subsidiaries’ investments at September 30, 2020 and December 31, 2019 follows (dollars in millions):
|  | September 30, 2020 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  | Gains |  |  | Losses |
Debt securities |  | $ | 384 |  |  | $ | 31 |  |  | $ | — |  |  | $ | 415 |
Money market funds and other |  |  | 71 |  |  |  | — |  |  |  | — |  |  |  | 71 |
|  | $ | 455 |  |  | $ | 31 |  |  | $ | — |  |  |  | 486 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (96 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 390 |
|  | December 31, 2019 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  | Gains |  |  | Losses |
Debt securities |  | $ | 359 |  |  | $ | 18 |  |  | $ | — |  |  | $ | 377 |
Money market funds and other |  |  | 85 |  |  |  | — |  |  |  | — |  |  |  | 85 |
|  | $ | 444 |  |  | $ | 18 |  |  | $ | — |  |  |  | 462 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (147 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 315 |
Schedule of Maturities of Investments | Scheduled maturities of investments in debt securities at September 30, 2020 were as follows (dollars in millions):
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 4 |  |  | $ | 4 |
Due after one year through five years |  |  | 127 |  |  |  | 135 |
Due after five years through ten years |  |  | 175 |  |  |  | 192 |
Due after ten years |  |  | 78 |  |  |  | 84 |
|  | $ | 384 |  |  | $ | 415 |

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