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Retirement Benefit Obligations - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Net pension and postretirement benefits liability	$ 120	$ 312
Net periodic benefit costs	3	1	$ 8
Pension plan contributions for next fiscal year	17
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated pension benefit obligations	$ 1,364	$ 1,567
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	23.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	65.00%
Cash and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	12.00%