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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Initial cost basis	$ 764		$ 764
Upward adjustments	899		899
Downward adjustments (including impairment)	(431)		(431)
Carrying amount, end of period	1,232		1,232
Upward adjustments	75	$ 5	94	$ 231
Downward adjustments (including impairment)	$ 0	$ 284	$ 86	$ 337

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Amount of 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
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-Publisher FASB
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-Topic 321
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-Section 50
-Paragraph 3
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-Publisher FASB
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-Section 50
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