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Benefit Plans (Detail) - Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 22	$ 28	$ 69
Interest cost	31	34	101	108
Expected return on plan assets	(41)	(37)	(135)	(117)
Amortization of prior service credit	0	(1)	0	(3)
Amortization of loss	8	14	25	44
Settlement loss	30	0	30	0
Net pension cost	$ 35	$ 32	$ 49	$ 101

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