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Fair Value Measurements and Investments - Schedule of Non-Marketable Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Sep. 30, 2025
Fair Value Disclosures [Abstract] |  |  |  |  |
Initial cost basis | $ 712 |  | $ 712 |  | $ 711
Adjustments: |  |  |  |  |
Upward adjustments | 574 |  | 574 |  | 564
Downward adjustments, including impairment | (219) |  | (219) |  | (219)
Carrying amount | 1,067 |  | 1,067 |  | $ 1,056
Upward adjustments | 7 | $ 7 | 10 | $ 7 |
Downward adjustments, including impairment | $ 0 | $ (31) | $ 0 | $ (49) |

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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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