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Investments of Insurance Subsidiaries | 3 Months Ended
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Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Investments of Insurance Subsidiaries | NOTE 5 — INVESTMENTS OF INSURANCE SUBSIDIARIES A summary of our insurance subsidiaries’ investments at March 31, 2020 and December 31, 2019 follows (dollars in millions):
|  | March 31, 2020 |
|  | Amortized Cost |  |  | Unrealized Amounts |  |  | Fair Value |
| Gains |  |  | Losses |
Debt securities |  | $ | 371 |  |  | $ | 15 |  |  | $ | (2 | ) |  | $ | 384 |
Money market funds and other |  |  | 54 |  |  |  | — |  |  |  | — |  |  |  | 54 |
|  | $ | 425 |  |  | $ | 15 |  |  | $ | (2 | ) |  |  | 438 |
Amounts classified as current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (113 | )
Investment carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 325 |
At March 31, 2020 and December 31, 2019, the investments in debt securities of our insurance subsidiaries were classified as “available-for-sale.” Changes in unrealized gains and losses that are not credit-related are recorded as adjustments to other comprehensive income (loss). Scheduled maturities of investments in debt securities at March 31, 2020 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 |  |  | 100 |  |  |  | 103 |
Due after five years through ten years |  |  | 188 |  |  |  | 195 |
Due after ten years |  |  | 74 |  |  |  | 77 |
|  | $ | 371 |  |  | $ | 384 |
The average expected maturity of the investments in debt securities at March 31, 2020 was 5.4 years, compared to the average scheduled maturity of 10.2 years. Expected and scheduled maturities may differ because the issuers of certain securities have the right to call, prepay or otherwise redeem such obligations prior to their scheduled maturity date.

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