Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 4	$ 6	$ 13	$ 18
Interest cost	12	9	36	30
Expected return on plan assets	(14)	(14)	(42)	(47)
Amortization of actuarial loss	1	1	2	4
Amortization of prior service credit	(1)	(1)	(3)	(3)
Settlement costs	0	0	0	(3)
Net periodic benefit cost	$ 2	$ 1	$ 6	5
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan				$ 186