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Components of Net Periodic Benefit Cost - Schedule of Components of Net Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Retirement Benefits [Abstract]
Service cost	$ 5	$ 4
Interest cost	22	13
Expected return on plan assets	(24)	(13)
Amortization of actuarial loss	2	1
Amortization of prior service credit	(1)	(1)
Net periodic benefit cost	$ 4	$ 4

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