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Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Restricted cash equivalents | $ 13,554 |  | $ 13,554 |  | $ 2,539
Accumulated unrealized gain (loss) on marketable debt securities, before tax |  |  |  |  | $ 300
Unrealized gain (loss) on marketable equity securities | (733) | $ (511) | (2,300) | $ (374) |
Money market funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Restricted cash equivalents | $ 10,800 |  | $ 10,800 |  |

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