Retirement Benefit Obligations - Schedule of Change in Projected Benefit Obligation, Change in Fair Value of Plan Assets and Funded Status (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year	$ 1,480	$ 1,701
Service cost	2	6	$ 9
Interest cost	42	44	44
Benefits paid	(71)	(80)
Settlements	(23)	(29)
Actuarial loss/(gain)	85	(176)
Foreign exchange rate changes	(40)	14
Amendments, transfers and other	9	0
Projected benefit obligation, end of the year	1,484	1,480	1,701
Beginning balance	1,360	1,389
Actual return on plan assets	77	35
Employer contributions	16	29
Benefits paid	(63)	(72)
Settlements	(23)	(29)
Foreign exchange rate changes	(42)	8
Ending balance	1,325	1,360	1,389
Funded status	(159)	(120)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year	334	368
Service cost	0	0	0
Interest cost	13	12	12
Benefits paid	(22)	(27)
Settlements	0	0
Actuarial loss/(gain)	25	(19)
Foreign exchange rate changes	0	0
Amendments, transfers and other	0	0
Projected benefit obligation, end of the year	350	334	368
Beginning balance	260	277
Actual return on plan assets	21	9
Employer contributions	4	1
Benefits paid	(22)	(27)
Settlements	0	0
Foreign exchange rate changes	0	0
Ending balance	263	260	277
Funded status	(87)	(74)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year	1,040	1,216
Service cost	2	6	9
Interest cost	25	29	29
Benefits paid	(41)	(45)
Settlements	(23)	(29)
Actuarial loss/(gain)	52	(151)
Foreign exchange rate changes	(39)	14
Amendments, transfers and other	9	0
Projected benefit obligation, end of the year	1,025	1,040	1,216
Beginning balance	1,100	1,112
Actual return on plan assets	56	26
Employer contributions	12	28
Benefits paid	(41)	(45)
Settlements	(23)	(29)
Foreign exchange rate changes	(42)	8
Ending balance	1,062	1,100	1,112
Funded status	37	60
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year	106	117
Service cost	0	0	0
Interest cost	4	3	3
Benefits paid	(8)	(8)
Settlements	0	0
Actuarial loss/(gain)	8	(6)
Foreign exchange rate changes	(1)	0
Amendments, transfers and other	0	0
Projected benefit obligation, end of the year	109	106	117
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	0	0
Benefits paid	0	0
Settlements	0	0
Foreign exchange rate changes	0	0
Ending balance	0	0	$ 0
Funded status	$ (109)	$ (106)