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Marketable and Other Securities | 12 Months Ended
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Dec. 31, 2023
Marketable Securities [Abstract] |
Marketable and Other Securities | Marketable and Other Securities The following table summarizes the fair value of cash equivalents and marketable debt securities, which approximates cost:
| Fair Value Level |  | December 31, 2023 |  | December 31, 2022
Cash and cash equivalents |  |  |  |  |
Cash and time deposits |  |  | $ | 8,977 |  |  | $ | 8,921 |
Available-for-sale debt securities |  |  |  |  |
U.S. government and agencies | 2 |  | 211 |  |  | 1,012 |
Corporate debt | 2 |  | 1,439 |  |  | 2,778 |
Sovereign debt | 2 |  | 734 |  |  | 1,828 |
Total available-for-sale debt securities – cash equivalents |  |  | 2,384 |  |  | 5,618 |
Money market funds | 1 |  | 7,491 |  |  | 4,613 |
Total cash and cash equivalents |  |  | $ | 18,853 |  |  | $ | 19,153 |
Marketable debt securities |  |  |  |  |
U.S. government and agencies | 2 |  | $ | 3,495 |  |  | $ | 4,357 |
Corporate debt | 2 |  | 3,274 |  |  | 5,147 |
Mortgage and asset-backed | 2 |  | 589 |  |  | 538 |
Sovereign debt | 2 |  | 255 |  |  | 2,108 |
Total available-for-sale debt securities – marketable securities |  |  | $ | 7,613 |  |  | $ | 12,150 |
Restricted cash |  |  |  |  |
Cash and cash equivalents |  |  | $ | 277 |  |  | $ | 341 |
Money market funds | 1 |  | 2,787 |  |  | 2,455 |
Total restricted cash |  |  | $ | 3,064 |  |  | $ | 2,796 |
Available-for-sale debt securities included above with contractual maturities(a) |  |  |  |  |
Due in one year or less |  |  | $ | 3,725 |  |  |
Due between one and five years |  |  | 5,500 |  |  |
Total available-for-sale debt securities with contractual maturities |  |  | $ | 9,225 |  |  |
__________ (a) Excludes mortgage and asset-backed securities of $589 million at December 31, 2023 as these securities are not due at a single maturity date. Proceeds from the sale of available-for-sale debt securities sold prior to maturity were $2.1 billion, $1.8 billion and $1.9 billion in the years ended December 31, 2023, 2022 and 2021. Available-for-sale debt securities had net unrealized gains of $196 million in the year ended December 31, 2023 and net unrealized losses of $319 million and an insignificant amount in years ended December 31, 2022 and 2021. Cumulative unrealized losses on available-for-sale debt securities were $160 million and $344 million at December 31, 2023 and 2022. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows:
| December 31, 2023 |  | December 31, 2022
Cash and cash equivalents | $ | 18,853 |  |  | $ | 19,153 |
Restricted cash included in Other current assets | 2,604 |  |  | 2,356 |
Restricted cash included in Other assets | 460 |  |  | 440 |
Total | $ | 21,917 |  |  | $ | 21,948 |

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent + Details
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