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Investments of Insurance Subsidiaries (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | A summary of our insurance subsidiaries’ investments at September 30, 2021 and December 31, 2020 follows (dollars in millions):
|  | September 30, 2021 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  | Gains |  |  | Losses |
Debt securities |  | $ | 391 |  |  | $ | 21 |  |  | $ | (1 | ) |  | $ | 411 |
Money market funds and other |  |  | 119 |  |  |  | — |  |  |  | — |  |  |  | 119 |
|  | $ | 510 |  |  | $ | 21 |  |  | $ | (1 | ) |  |  | 530 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (112 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 418 |
|  | December 31, 2020 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  | Gains |  |  | Losses |
Debt securities |  | $ | 384 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 416 |
Money market funds and other |  |  | 88 |  |  |  | — |  |  |  | — |  |  |  | 88 |
|  | $ | 472 |  |  | $ | 32 |  |  | $ | — |  |  |  | 504 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (116 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 388 |
Schedule of Maturities of Investments | Scheduled maturities of investments in debt securities at September 30, 2021 were as follows (dollars in millions):
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 134 |  |  |  | 141 |
Due after five years through ten years |  |  | 177 |  |  |  | 187 |
Due after ten years |  |  | 80 |  |  |  | 83 |
|  | $ | 391 |  |  | $ | 411 |

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