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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Carrying value of equity securities by balance sheet location | The carrying values of our equity securities were included in the following line items in our consolidated balance sheets (in millions):
| Fair Value with Changes Recognized in Income | Measurement Alternative — No Readily Determinable Fair Value
December 31, 2023 |  |
Marketable securities | $ | 345 |  | $ | — |
Other investments | 76 |  | 42 |
Other noncurrent assets | 1,585 |  | — |
Total equity securities | $ | 2,006 |  | $ | 42 |
December 31, 2022 |  |
Marketable securities | $ | 308 |  | $ | — |
Other investments | 459 |  | 42 |
Other noncurrent assets | 1,303 |  | — |
Total equity securities | $ | 2,070 |  | $ | 42 |
Net unrealized gains and losses related to equity securities still held at the end of the period | The calculation of net unrealized gains and losses recognized during the year related to equity securities still held at the end of the year is as follows (in millions):
Year Ended December 31, | 2023 | 2022
Net gains (losses) recognized during the year related to equity securities | $ | 371 |  | $ | (236) |
Less: Net gains (losses) recognized during the year related to equity securities sold during the year | 52 |  | 7 |
Net unrealized gains (losses) recognized during the year related to equity securities still held at the end of the year | $ | 319 |  | $ | (243) |
Schedule of available-for-sale and trading securities | Our debt securities consisted of the following (in millions):
|  | Gross Unrealized | Estimated Fair Value
| Cost | Gains | Losses
December 31, 2023 |  |  |  |
Trading securities | $ | 43 |  | $ | — |  | $ | (2) |  | $ | 41 |
Available-for-sale securities | 1,136 |  | 26 |  | (28) |  | 1,134 |
Total debt securities | $ | 1,179 |  | $ | 26 |  | $ | (30) |  | $ | 1,175 |
December 31, 2022 |  |  |  |
Trading securities | $ | 43 |  | $ | — |  | $ | (4) |  | $ | 39 |
Available-for-sale securities | 979 |  | 26 |  | (61) |  | 944 |
Total debt securities | $ | 1,022 |  | $ | 26 |  | $ | (65) |  | $ | 983 |
Carrying values of debt securities by balance sheet location | The carrying values of our debt securities were included in the following line items in our consolidated balance sheets (in millions):
| December 31, 2023 |  | December 31, 2022
| Trading Securities | Available-for-Sale Securities |  | Trading Securities | Available-for-Sale Securities
Marketable securities | $ | 41 |  | $ | 914 |  |  | $ | 39 |  | $ | 722 |
Other noncurrent assets | — |  | 220 |  |  | — |  | 222 |
Total debt securities | $ | 41 |  | $ | 1,134 |  |  | $ | 39 |  | $ | 944 |
Contractual maturities of available-for-sale debt securities | The contractual maturities of these available-for-sale debt securities as of December 31, 2023 were as follows (in millions):
| Cost | Estimated Fair Value |  |  |
Within 1 year | $ | 484 |  | $ | 483 |  |  |  |
After 1 year through 5 years | 420 |  | 427 |  |  |  |
After 5 years through 10 years | 37 |  | 48 |  |  |  |
After 10 years | 195 |  | 176 |  |  |  |
Total | $ | 1,136 |  | $ | 1,134 |  |  |  |
Realized Gain (Loss) on Investments | The sale and/or maturity of available-for-sale debt securities resulted in the following realized activity (in millions):
Year Ended December 31, | 2023 | 2022 | 2021
Gross gains | $ | 3 |  | $ | 5 |  | $ | 6 |
Gross losses | (10) |  | (136) |  | (10) |
Proceeds | 361 |  | 1,498 |  | 1,197 |

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