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A summary of marketable securities, all of which were classified as current, was as follows:
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June 30,
2024 |
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December 31,
2023 |
| In millions |
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Cost |
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Gross unrealized gains/(losses) (1)
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Estimated
fair value |
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Cost |
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Gross unrealized gains/(losses) (1)
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Estimated
fair value |
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| Equity securities |
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| Level 1 |
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| Publicly-traded shares |
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$ |
7
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$ |
(3) |
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$ |
4
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$ |
— |
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$ |
— |
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$ |
— |
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| Level 2 |
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| Debt mutual funds |
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295
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—
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295
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272 |
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— |
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272 |
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| Certificates of deposit |
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257
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—
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257
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246 |
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— |
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246 |
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| Equity mutual funds |
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17
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7
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24
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22 |
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6 |
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28 |
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| Debt securities |
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13
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—
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13
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16 |
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— |
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16 |
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| Marketable securities |
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$ |
589
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$ |
4
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$ |
593
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$ |
556 |
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$ |
6 |
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$ |
562 |
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(1) Unrealized gains and losses for debt securities are recorded in other comprehensive income while unrealized gains and losses for equity securities are recorded in our Condensed Consolidated Statements of Net Income.
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