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Fair Value Measurements and Investments - Schedule of Non-Marketable Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Fair Value Disclosures [Abstract] |  |  |  |
Initial cost basis | $ 722 |  | $ 722 |
Upward adjustments | 810 |  | 810 |
Downward adjustments (including impairment) | (350) |  | (350) |
Carrying amount, end of period | 1,182 |  | 1,182 |
Upward adjustments | 5 | $ 180 | 231 | $ 323
Downward adjustments (including impairment) | $ (284) | $ 0 | $ (337) | $ (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 https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
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