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Retirement Benefit Obligations - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Net pension and postretirement benefits liability	$ (194)	$ (159)
Net periodic benefit costs	7	(2)	$ 3
Pension plan contributions for next fiscal year	22
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated pension benefit obligations	$ 1,397	$ 1,365
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	20.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	71.00%
Cash and other
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	9.00%