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SEGMENTS - Geographic Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 8,831	$ 7,940	$ 6,585
Long-Lived Assets	1,644	1,549	1,319
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,535	5,032	4,265
Long-Lived Assets	1,339	1,273	1,063
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,296	2,908	2,320
Long-Lived Assets	$ 305	$ 276	$ 256

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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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