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Investments of Insurance Subsidiaries (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | A summary of our insurance subsidiaries’ investments at March 31, 2019 and December 31, 2018 follows (dollars in millions):
|  | March 31, 2019 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |  |
|  | Gains |  |  | Losses |  |
Debt securities |  | $ | 336 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 347 |
Money market funds and other |  |  | 81 |  |  |  | — |  |  |  | — |  |  |  | 81 |
|  | $ | 417 |  |  | $ | 11 |  |  | $ | — |  |  |  | 428 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (90 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 338 |
|  | December 31, 2018 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |  |
|  | Gains |  |  | Losses |  |
Debt securities |  | $ | 338 |  |  | $ | 5 |  |  | $ | (2 | ) |  | $ | 341 |
Money market funds and other |  |  | 68 |  |  |  | — |  |  |  | — |  |  |  | 68 |
|  | $ | 406 |  |  | $ | 5 |  |  | $ | (2 | ) |  |  | 409 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (47 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 362 |
Schedule of Maturities of Investments | Scheduled maturities of investments in debt securities at March 31, 2019 were as follows (dollars in millions):
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 3 |  |  | $ | 3 |
Due after one year through five years |  |  | 64 |  |  |  | 65 |
Due after five years through ten years |  |  | 201 |  |  |  | 209 |
Due after ten years |  |  | 68 |  |  |  | 70 |
|  | $ | 336 |  |  | $ | 347 |

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