Retirement Benefit Obligations - Schedule of Components of Net Periodic Costs (Income) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	$ 2	$ 6	$ 9
Interest costs on projected benefit obligations	42	44	44
Expected return on plan assets	(61)	(71)	(75)
Amortization of deferred losses	14	23	21
Amortization of prior service costs	(3)	(3)	(4)
Settlements, curtailments and other	4	4	6
Net periodic benefit (income) costs – Total	(2)	3	1
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	0	0	0
Interest costs on projected benefit obligations	4	3	3
Expected return on plan assets	0	0	0
Amortization of deferred losses	0	0	0
Amortization of prior service costs	(3)	(3)	(4)
Settlements, curtailments and other	0	0	0
Net periodic benefit (income) costs – Total	1	0	(1)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	0	0	0
Interest costs on projected benefit obligations	13	12	12
Expected return on plan assets	(15)	(18)	(18)
Amortization of deferred losses	4	5	5
Amortization of prior service costs	0	0	0
Settlements, curtailments and other	0	0	3
Net periodic benefit (income) costs – Total	2	(1)	2
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	2	6	9
Interest costs on projected benefit obligations	25	29	29
Expected return on plan assets	(46)	(53)	(57)
Amortization of deferred losses	10	18	16
Amortization of prior service costs	0	0	0
Settlements, curtailments and other	4	4	3
Net periodic benefit (income) costs – Total	$ (5)	$ 4	$ 0