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Investments of Insurance Subsidiaries (Tables) | 9 Months Ended
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Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | A summary of our insurance subsidiaries’ investments at September 30, 2017 and December 31, 2016 follows (dollars in millions):
|  | September 30, 2017 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  |  | Gains |  |  | Losses |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and municipalities |  | $ | 352 |  |  |  | $14 |  |  |  | $— |  |  | $ | 366 |
Money market funds |  |  | 52 |  |  |  | — |  |  |  | — |  |  |  | 52 |
|  |  | 404 |  |  |  | 14 |  |  |  | — |  |  |  | 418 |
Equity securities |  |  | 1 |  |  |  | 2 |  |  |  | — |  |  |  | 3 |
|  | $ | 405 |  |  |  | $16 |  |  |  | $— |  |  |  | 421 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (53 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 368 |
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
|  |  | Gains |  |  | Losses |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and municipalities |  | $ | 345 |  |  |  | $9 |  |  |  | $(1) |  |  | $ | 353 |
Money market funds |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | 28 |
|  |  | 373 |  |  |  | 9 |  |  |  | (1) |  |  |  | 381 |
Equity securities |  |  | 1 |  |  |  | 3 |  |  |  | — |  |  |  | 4 |
|  | $ | 374 |  |  |  | $12 |  |  |  | $(1) |  |  |  | 385 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (49 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 336 |
Schedule of Maturities of Investments | Scheduled maturities of investments in debt securities at September 30, 2017 were as follows (dollars in millions):
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 100 |  |  | $ | 100 |
Due after one year through five years |  |  | 76 |  |  |  | 80 |
Due after five years through ten years |  |  | 178 |  |  |  | 187 |
Due after ten years |  |  | 50 |  |  |  | 51 |
|  | $ | 404 |  |  | $ | 418 |

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