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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | $ 9,225 |
Total cash and cash equivalents | 18,853 | $ 19,153
Cash and cash equivalents | 277 | 341
Total restricted cash | 3,064 | 2,796
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 |
Cash and cash equivalents |  |
Summary of Investment Holdings [Line Items] |  |
Cash and time deposits | 8,977 | 8,921
Total available-for-sale debt securities with contractual maturities | 2,384 | 5,618
Total available-for-sale debt securities with contractual maturities | 2,384 | 5,618
Cash and cash equivalents | Level 2 | U.S. government and agencies |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 211 | 1,012
Total available-for-sale debt securities with contractual maturities | 211 | 1,012
Cash and cash equivalents | Level 2 | Corporate debt |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 1,439 | 2,778
Total available-for-sale debt securities with contractual maturities | 1,439 | 2,778
Cash and cash equivalents | Level 2 | Sovereign debt |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 734 | 1,828
Total available-for-sale debt securities with contractual maturities | 734 | 1,828
Cash and cash equivalents | Level 1 |  |
Summary of Investment Holdings [Line Items] |  |
Money market funds | 7,491 | 4,613
Marketable debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 7,613 | 12,150
Total available-for-sale debt securities with contractual maturities | 7,613 | 12,150
Marketable debt securities | Level 2 | U.S. government and agencies |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,495 | 4,357
Total available-for-sale debt securities with contractual maturities | 3,495 | 4,357
Marketable debt securities | Level 2 | Corporate debt |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,274 | 5,147
Total available-for-sale debt securities with contractual maturities | 3,274 | 5,147
Marketable debt securities | Level 2 | Sovereign debt |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 255 | 2,108
Total available-for-sale debt securities with contractual maturities | 255 | 2,108
Marketable debt securities | Level 2 | Mortgage and asset-backed |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 589 | 538
Total available-for-sale debt securities with contractual maturities | 589 | 538
Restricted cash - cash equivalents | Level 1 |  |
Summary of Investment Holdings [Line Items] |  |
Money market funds | $ 2,787 | $ 2,455

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