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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | $ 11,675 |
Total cash and cash equivalents | 22,910 | $ 19,872
Cash and cash equivalents | 338 | 294
Total restricted cash | 3,300 | 3,092
Due in one year or less | 6,683 |
Due between one and five years | 4,992 |
Total available-for-sale debt securities with contractual maturities | 11,675 |
Cash and cash equivalents |  |
Summary of Investment Holdings [Line Items] |  |
Cash and time deposits | 11,946 | 12,471
Total available-for-sale debt securities with contractual maturities | 5,480 | 2,351
Total available-for-sale debt securities with contractual maturities | 5,480 | 2,351
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 | 808 | 26
Total available-for-sale debt securities with contractual maturities | 808 | 26
Cash and cash equivalents | Level 2 | Corporate debt |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,749 | 1,541
Total available-for-sale debt securities with contractual maturities | 3,749 | 1,541
Cash and cash equivalents | Level 2 | Sovereign debt |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 924 | 785
Total available-for-sale debt securities with contractual maturities | 924 | 785
Cash and cash equivalents | Level 1 |  |
Summary of Investment Holdings [Line Items] |  |
Money market funds | 5,484 | 5,050
Marketable debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 6,792 | 7,265
Total available-for-sale debt securities with contractual maturities | 6,792 | 7,265
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 | 2,479 | 3,082
Total available-for-sale debt securities with contractual maturities | 2,479 | 3,082
Marketable debt securities | Level 2 | Mortgage and asset-backed |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 548 | 591
Total available-for-sale debt securities with contractual maturities | 548 | 591
Marketable debt securities | Level 2 | Corporate debt and other |  |
Summary of Investment Holdings [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,765 | 3,592
Total available-for-sale debt securities with contractual maturities | 3,765 | 3,592
Other Current Assets | Level 1 |  |
Summary of Investment Holdings [Line Items] |  |
Money market funds | $ 2,962 | $ 2,798

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