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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Retirement Benefit Obligations - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Net pension and postretirement benefits liability	$ (159)	$ (120)
Net periodic benefit costs	(2)	3	$ 1
Pension plan contributions for next fiscal year	20
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated pension benefit obligations	$ 1,365	$ 1,364
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	68.00%
Cash And Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension asset portfolio, percentage	9.00%