Retirement Benefit Obligations - Schedule of Accumulated and Projected Benefit Obligations and Fair Value of Plan Assets for Funded and Unfunded Pension Plans (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 1,513	$ 1,484	$ 1,480
Fair value of plan assets	1,319	1,325	1,360
Domestic
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	353	350	334
Accumulated benefit obligation	353	350
Fair value of plan assets	258	263	260
Domestic | Funded Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	343	335
Accumulated benefit obligation	343	335
Fair value of plan assets	258	263
Domestic | Unfunded Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	10	15
Accumulated benefit obligation	10	15
Fair value of plan assets	0	0
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	1,051	1,025	1,040
Accumulated benefit obligation	1,044	1,015
Fair value of plan assets	1,061	1,062	$ 1,100
Foreign Pension Benefits | Funded Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	978	955
Accumulated benefit obligation	971	945
Fair value of plan assets	1,061	1,062
Foreign Pension Benefits | Unfunded Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	73	70
Accumulated benefit obligation	73	70
Fair value of plan assets	$ 0	$ 0