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Employee Retirement Plans - Schedule of Net Periodic Pension (Income) Cost (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 8	$ 9
Interest cost	34	36	35
Expected return on assets	(48)	(44)	(45)
Curtailment gain	(1)	0	0
Amortization of:
Actuarial loss (gain)	5	1	(3)
Net benefit cost (income)	$ (1)	$ 1	$ (4)

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