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, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year		$ 1,701	$ 1,723
Service cost		6	9	$ 10
Interest cost		44	44	66
Benefits paid		(80)	(70)
Settlements	[1]	(29)	(36)
Actuarial loss/(gain)	[2]	(176)	47
Foreign exchange rate changes		14	(15)
Amendments, transfers and other		0	(1)
Projected benefit obligation, end of the year		1,480	1,701	1,723
Beginning balance		1,389	1,367
Actual return on plan assets		35	106
Employer contributions		29	26
Benefits paid		(72)	(62)
Settlements	[2]	(29)	(36)
Foreign exchange rate changes		8	(12)
Ending balance		1,360	1,389	1,367
Funded status		(120)	(312)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year		368	396
Service cost		0	0	0
Interest cost		12	12	17
Benefits paid		(27)	(23)
Settlements	[1]	0	(13)
Actuarial loss/(gain)	[2]	(19)	(4)
Foreign exchange rate changes		0	0
Amendments, transfers and other		0	0
Projected benefit obligation, end of the year		334	368	396
Beginning balance		277	287
Actual return on plan assets		9	23
Employer contributions		1	3
Benefits paid		(27)	(23)
Settlements	[2]	0	(13)
Foreign exchange rate changes		0	0
Ending balance		260	277	287
Funded status		(74)	(91)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year		1,216	1,201
Service cost		6	9	10
Interest cost		29	29	44
Benefits paid		(45)	(39)
Settlements	[1]	(29)	(23)
Actuarial loss/(gain)	[2]	(151)	54
Foreign exchange rate changes		14	(15)
Amendments, transfers and other		0	0
Projected benefit obligation, end of the year		1,040	1,216	1,201
Beginning balance		1,112	1,080
Actual return on plan assets		26	83
Employer contributions		28	23
Benefits paid		(45)	(39)
Settlements	[2]	(29)	(23)
Foreign exchange rate changes		8	(12)
Ending balance		1,100	1,112	1,080
Funded status		60	(104)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning of the year		117	126
Service cost		0	0	0
Interest cost		3	3	5
Benefits paid		(8)	(8)
Settlements	[1]	0	0
Actuarial loss/(gain)	[2]	(6)	(3)
Foreign exchange rate changes		0	0
Amendments, transfers and other		0	(1)
Projected benefit obligation, end of the year		106	117	126
Beginning balance		0	0
Actual return on plan assets		0	0
Employer contributions		0	0
Benefits paid		0	0
Settlements	[2]	0	0
Foreign exchange rate changes		0	0
Ending balance		0	0	$ 0
Funded status		$ (106)	$ (117)

[1] Amounts related to payments made to former employees of the Company in full settlement of their deferred pension benefits.

[2] Fiscal 2018 actuarial gains related to domestic and foreign pension plans primarily relates to the increase in discount rates for the U.S. and U.K. plans used in measuring plan obligations as of June 30, 2018. Fiscal 2017 actuarial losses for the Company's foreign pension plans are primarily related to the decrease in discount rates used in measuring plan obligations as of June 30, 2017. Fiscal 2017 actuarial gains related to domestic pension plans primarily relate to the increase in discount rates for the U.S. plans used in measuring plan obligations as of June 30, 2017.