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Fair Value Measurements - Summary of Investment Income, Net Gains and Losses, Funds restricted for Specific Transactions and Disbursements Related to Investments (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Investment income	[1]	$ 3	$ 3	$ 8	$ 9
Net gains (losses)	[1]	3	9	(14)	39
Funds restricted for specific transactions		8	0	8	5
Disbursements		$ (19)	$ (21)	$ (25)	$ (37)
[1] Included in the net interest and other expense (income) caption within the Statements of Condensed Consolidated Comprehensive Income (Loss).

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- Definition

The cash outflow of all demand deposits, including checking and negotiable order or withdrawal (NOW) accounts.

+ References

No definition available.

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- Definition

Funds restricted for specific transactions.

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- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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