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Financial Instruments - Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities, by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 3,297 | $ 3,199
Due after one year through five years | 2,259 | 2,334
Amortized Cost | 5,556 | 5,533
Estimated Fair Value |  |
Due in one year or less | 3,297 | 3,204
Due after one year through five years | 2,251 | 2,336
Total | $ 5,548 | $ 5,540

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