Retirement Benefit Obligations - Schedule of Components of Net Periodic Costs (Income) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	$ 2	$ 2	$ 6
Interest costs on projected benefit obligations	34	42	44
Expected return on plan assets	(59)	(61)	(71)
Amortization of deferred losses	16	14	23
Amortization of prior service costs	(3)	(3)	(3)
Settlements, curtailments and other	17	4	4
Net periodic benefit (income) costs – Total	7	(2)	3
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	0	0	0
Interest costs on projected benefit obligations	3	4	3
Expected return on plan assets	0	0	0
Amortization of deferred losses	0	0	0
Amortization of prior service costs	(3)	(3)	(3)
Settlements, curtailments and other	0	0	0
Net periodic benefit (income) costs – Total	0	1	0
Domestic
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	0	0	0
Interest costs on projected benefit obligations	11	13	12
Expected return on plan assets	(16)	(15)	(18)
Amortization of deferred losses	5	4	5
Amortization of prior service costs	0	0	0
Settlements, curtailments and other	12	0	0
Net periodic benefit (income) costs – Total	12	2	(1)
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost benefits earned during the period	2	2	6
Interest costs on projected benefit obligations	20	25	29
Expected return on plan assets	(43)	(46)	(53)
Amortization of deferred losses	11	10	18
Amortization of prior service costs	0	0	0
Settlements, curtailments and other	5	4	4
Net periodic benefit (income) costs – Total	$ (5)	$ (5)	$ 4