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Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Retirement Benefits [Abstract]    
Service cost $ 4 $ 4
Interest cost 13 13
Expected return on plan assets (13) (14)
Amortization of actuarial loss 1 1
Amortization of prior service credit (1) (1)
Settlement costs 0 (1)
Net periodic benefit cost $ 4 $ 4