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Investments of Insurance Subsidiaries (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | A summary of our insurance subsidiaries’ investments at September 30, 2018 and December 31, 2017 follows (dollars in millions):
|  | September 30, 2018 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  | Gains |  |  | Losses |
Debt securities |  | $ | 343 |  |  | $ | 4 |  |  | $ | (2 | ) |  | $ | 345 |
Money market funds and other |  |  | 68 |  |  |  | — |  |  |  | — |  |  |  | 68 |
|  | $ | 411 |  |  | $ | 4 |  |  | $ | (2 | ) |  |  | 413 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (46 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 367 |
|  | 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 September 30, 2018 were as follows (dollars in millions):
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 9 |  |  | $ | 9 |
Due after one year through five years |  |  | 57 |  |  |  | 58 |
Due after five years through ten years |  |  | 210 |  |  |  | 212 |
Due after ten years |  |  | 67 |  |  |  | 66 |
|  | $ | 343 |  |  | $ | 345 |

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