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, 2019	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 1,484	$ 1,480	$ 1,701
Fair value of plan assets	1,325	1,360	1,389
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	350	334	368
Accumulated benefit obligation	350	334
Fair value of plan assets	263	260	277
United States [Member] | Funded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	335	320
Accumulated benefit obligation	335	320
Fair value of plan assets	263	260
United States [Member] | Unfunded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	15	14
Accumulated benefit obligation	15	14
Fair value of plan assets	0	0
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	1,025	1,040	1,216
Accumulated benefit obligation	1,015	1,030
Fair value of plan assets	1,062	1,100	$ 1,112
Foreign Pension Benefits [Member] | Funded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	955	971
Accumulated benefit obligation	945	961
Fair value of plan assets	1,062	1,100
Foreign Pension Benefits [Member] | Unfunded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	70	69
Accumulated benefit obligation	70	69
Fair value of plan assets	$ 0	$ 0