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Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Retirement Benefits [Abstract]        
Service cost $ 5 $ 5 $ 9 $ 9
Interest cost 12 12 25 24
Expected return on plan assets (14) (14) (28) (28)
Amortization of actuarial loss 1 0 2 1
Amortization of prior service credit (1) (1) (2) (2)
Settlement costs 0 0 (1) 0
Net periodic benefit cost $ 3 $ 2 $ 7 $ 4