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Description of Business, Accounting Policies, and Supplemental Disclosures - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire nonmarketable securities | $ 1,300 | $ 2,750 | $ 1,250 |
Nonmarketable securities, agreed additional investment | 2,700 |  |  |
Equity investments in private companies | 989 |  |  | $ 754
Equity method investments | 1,200 |  |  | 614
Fair Value, Inputs, Level 3 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Estimated fair value of nonmarketable securities | 13,800 |  |  |
Equity Warrant | Fair Value, Inputs, Level 2 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of warrants | $ 2,700 |  |  | $ 2,200

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