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Fair Value Measurements and Investments - Schedule of Non-Marketable Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Initial cost basis	$ 711		$ 711
Adjustments:
Upward adjustments	909		910
Downward adjustments, including impairment	(552)		(465)
Carrying amount	1,068		$ 1,156
Upward adjustments	0	$ 9
Downward adjustments, including impairment	$ (91)	$ 0

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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
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 3
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