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, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	$ 1,484	$ 1,480
Service cost	(2)	(2)	$ (6)
Interest cost	34	42	44
Benefits paid	(64)	(71)
Settlements	57	23
Actuarial loss/(gain)	146	85
Foreign exchange rate changes	(32)	(40)
Amendments, transfers and other	0	9
Projected benefit obligation, end of the year	1,513	1,484	1,480
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,325	1,360
Actual return on plan assets	110	77
Employer contributions	30	16
Benefits paid	(56)	(63)
Settlements	(57)	(23)
Foreign exchange rate changes	(33)	(42)
Ending balance	1,319	1,325	1,360
Funded status	(194)	(159)
Domestic
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	350	334
Service cost	0	0	0
Interest cost	11	13	12
Benefits paid	(17)	(22)
Settlements	30	0
Actuarial loss/(gain)	39	25
Foreign exchange rate changes	0	0
Amendments, transfers and other	0	0
Projected benefit obligation, end of the year	353	350	334
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	263	260
Actual return on plan assets	25	21
Employer contributions	17	4
Benefits paid	(17)	(22)
Settlements	(30)	0
Foreign exchange rate changes	0	0
Ending balance	258	263	260
Funded status	(95)	(87)
Foreign Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	1,025	1,040
Service cost	(2)	(2)	(6)
Interest cost	20	25	29
Benefits paid	(39)	(41)
Settlements	27	23
Actuarial loss/(gain)	102	52
Foreign exchange rate changes	(32)	(39)
Amendments, transfers and other	0	9
Projected benefit obligation, end of the year	1,051	1,025	1,040
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,062	1,100
Actual return on plan assets	85	56
Employer contributions	13	12
Benefits paid	(39)	(41)
Settlements	(27)	(23)
Foreign exchange rate changes	(33)	(42)
Ending balance	1,061	1,062	1,100
Funded status	10	37
Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	109	106
Service cost	0	0	0
Interest cost	3	4	3
Benefits paid	(8)	(8)
Settlements	0	0
Actuarial loss/(gain)	5	8
Foreign exchange rate changes	0	(1)
Amendments, transfers and other	0	0
Projected benefit obligation, end of the year	109	109	106
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
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)	$ (109)