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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, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Fair Value Disclosures [Abstract] |  |  |  |
Initial cost basis | $ 908 |  | $ 908 |
Upward adjustments | 806 |  | 806 |
Downward adjustments (including impairment) | (66) |  | (66) |
Carrying amount, end of period | 1,648 |  | 1,648 |
Upward adjustments | 2 | $ 129 | 226 | $ 143
Downward adjustments (including impairment) | $ (53) | $ 0 | $ (53) | $ (2)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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