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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 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
June 30, 2023 |  |
Marketable securities | $ | 327 |  | $ | — |
Other investments | 116 |  | 42 |
Other noncurrent assets | 1,481 |  | — |
Total equity securities | $ | 1,924 |  | $ | 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 period related to equity securities still held at the end of the period is as follows (in millions):
| Three Months Ended
| June 30, 2023 | July 1, 2022
Net gains (losses) recognized during the period related to equity securities | $ | 130 |  | $ | (261) |
Less: Net gains (losses) recognized during the period related to equity securities sold during the period | 22 |  | (129) |
Net unrealized gains (losses) recognized during the period related to equity securities still held at the end of the period | $ | 108 |  | $ | (132) |
| Six Months Ended
| June 30, 2023 | July 1, 2022
Net gains (losses) recognized during the period related to equity securities | $ | 255 |  | $ | (361) |
Less: Net gains (losses) recognized during the period related to equity securities sold during the period | 33 |  | (254) |
Net unrealized gains (losses) recognized during the period related to equity securities still held at the end of the period | $ | 222 |  | $ | (107) |
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
June 30, 2023 |  |  |  |
Trading securities | $ | 42 |  | $ | — |  | $ | (4) |  | $ | 38 |
Available-for-sale securities | 1,140 |  | 23 |  | (44) |  | 1,119 |
Total debt securities | $ | 1,182 |  | $ | 23 |  | $ | (48) |  | $ | 1,157 |
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):
| June 30, 2023 |  | December 31, 2022
| Trading Securities | Available-for-Sale Securities |  | Trading Securities | Available-for-Sale Securities
Marketable securities | $ | 38 |  | $ | 898 |  |  | $ | 39 |  | $ | 722 |
Other noncurrent assets | — |  | 221 |  |  | — |  | 222 |
Total debt securities | $ | 38 |  | $ | 1,119 |  |  | $ | 39 |  | $ | 944 |
Contractual maturities of available-for-sale debt securities | The contractual maturities of these available-for-sale debt securities as of June 30, 2023 were as follows (in millions):
| Cost | Estimated Fair Value |  |  |
Within 1 year | $ | 502 |  | $ | 489 |  |  |  |
After 1 year through 5 years | 422 |  | 434 |  |  |  |
After 5 years through 10 years | 32 |  | 36 |  |  |  |
After 10 years | 184 |  | 160 |  |  |  |
Total | $ | 1,140 |  | $ | 1,119 |  |  |  |
Realized Gain (Loss) on Investments | The sale and/or maturity of available-for-sale debt securities resulted in the following realized activity (in millions):
| Three Months Ended |  | Six Months Ended
| June 30, 2023 | July 1, 2022 |  | June 30, 2023 | July 1, 2022
Gross gains | $ | 2 |  | $ | 2 |  |  | $ | 2 |  | $ | 3 |
Gross losses | (1) |  | (3) |  |  | (4) |  | (8) |
Proceeds | 40 |  | 113 |  |  | 108 |  | 344 |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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