Fair Value Measurements and Investments - Schedule of Non-Marketable Equity Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2023 |
Mar. 31, 2022 |
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| Fair Value Disclosures [Abstract] | ||||
| Initial cost basis | $ 754 | $ 754 | ||
| Upward adjustments | 829 | 829 | ||
| Downward adjustments (including impairment) | (438) | (438) | ||
| Carrying amount, end of period | 1,145 | 1,145 | ||
| Upward adjustments | 2 | $ 2 | 19 | $ 226 |
| Downward adjustments (including impairment) | $ (89) | $ (53) | $ (89) | $ (53) |
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- Definition Amount of investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Equity Securities Without Readily Determinable Fair Value, Cost No definition available.
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