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, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 1,480	$ 1,701	$ 1,723
Fair value of plan assets	1,360	1,389	1,367
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	334	368	396
Accumulated benefit obligation	334	368
Fair value of plan assets	260	277	287
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	1,040	1,216	1,201
Accumulated benefit obligation	1,030	1,198
Fair value of plan assets	1,100	1,112	$ 1,080
Funded Plans [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	320	354
Accumulated benefit obligation	320	354
Fair value of plan assets	260	277
Funded Plans [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	971	1,144
Accumulated benefit obligation	961	1,126
Fair value of plan assets	1,100	1,112
Unfunded Plans [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	14	14
Accumulated benefit obligation	14	14
Fair value of plan assets	0	0
Unfunded Plans [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	69	72
Accumulated benefit obligation	69	72
Fair value of plan assets	$ 0	$ 0