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Segment Information - Long-Lived Assets and Revenue by Geographical Areas (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 5,301	$ 4,463	$ 4,475
Long-lived Assets	632	604
United States
Segment Reporting Information [Line Items]
Revenues	2,363	1,934	1,956
Long-lived Assets	439	426
Germany
Segment Reporting Information [Line Items]
Revenues	662	511	504
Long-lived Assets	52	43
United Kingdom
Segment Reporting Information [Line Items]
Revenues	620	551	596
Long-lived Assets	43	49
All other territories
Segment Reporting Information [Line Items]
Revenues	1,656	1,467	$ 1,419
Long-lived Assets	$ 98	$ 86

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- Definition

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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