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Fair Value Measurements and Investments - Schedule of Non-Marketable Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Fair Value Disclosures [Abstract]
Initial cost basis	$ 714		$ 711
Adjustments:
Upward adjustments	567		564
Downward adjustments, including impairment	(219)		(219)
Carrying amount	1,062		$ 1,056
Upward adjustments	3	$ 0
Downward adjustments, including impairment	$ 0	$ (91)

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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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Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

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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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