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Retirement Benefit Obligations - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Net pension and postretirement benefits liability	$ (13)	$ (32)
Net periodic benefit costs	13	0	$ (1)
Pension plan contributions for next fiscal year	$ 23
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	16.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	74.00%
Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	10.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated pension benefit obligations	$ 883	$ 1,011