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Financial Instruments - Amortized Cost and Estimated Fair Value of Marketable Securities, by Contractual Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 6,067 | $ 5,751
Due after one year through five years | 2,362 | 4,768
Amortized Cost | 8,429 | 10,519
Estimated Fair Value |  |
Due in one year or less | 6,010 | 5,697
Due after one year through five years | 2,326 | 4,677
Total | $ 8,336 | $ 10,374

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