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Benefit Plans (Detail) - Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 22	$ 20	$ 47
Interest cost	28	35	70	74
Expected return on plan assets	(38)	(38)	(93)	(80)
Amortization of prior service credit	0	(1)	0	(2)
Amortization of loss	7	14	17	30
Net pension cost	$ 5	$ 33	$ 13	$ 69

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