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Investments of Insurance Subsidiaries (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | A summary of our insurance subsidiaries’ investments at March 31, 2018 and December 31, 2017 follows (dollars in millions):
|  | March 31, 2018 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  |  | Gains |  |  | Losses |  |
Debt securities |  | $ | 251 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 256 |
Money market funds and other |  |  | 205 |  |  |  | — |  |  |  | — |  |  |  | 205 |
|  | $ | 456 |  |  | $ | 5 |  |  | $ | — |  |  |  | 461 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 417 |
|  | December 31, 2017 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  |  | Gains |  |  | Losses |  |
Debt securities |  | $ | 361 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 371 |
Money market funds and other |  |  | 101 |  |  |  | — |  |  |  | — |  |  |  | 101 |
|  | $ | 462 |  |  | $ | 10 |  |  | $ | — |  |  |  | 472 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (54 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 418 |
Schedule of Maturities of Investments | Scheduled maturities of investments in debt securities at March 31, 2018 were as follows (dollars in millions):
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 29 |  |  | $ | 29 |
Due after one year through five years |  |  | 34 |  |  |  | 35 |
Due after five years through ten years |  |  | 166 |  |  |  | 170 |
Due after ten years |  |  | 22 |  |  |  | 22 |
|  | $ | 251 |  |  | $ | 256 |

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