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Segment Information - Schedule of Long-Lived Assets and Revenue by Geographical Areas (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 6,037	$ 5,919	$ 5,301
Long-lived Assets	703	641
United States
Segment Reporting Information [Line Items]
Revenues	2,766	2,744	2,363
Long-lived Assets	473	468
United Kingdom
Segment Reporting Information [Line Items]
Revenues	726	734	620
Long-lived Assets	39	30
Germany
Segment Reporting Information [Line Items]
Revenues	535	613	662
Long-lived Assets	98	68
All other territories
Segment Reporting Information [Line Items]
Revenues	2,010	1,828	$ 1,656
Long-lived Assets	$ 93	$ 75

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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