Retirement Benefit Obligations - Schedule of Accumulated Benefit Obligation Exceeds Fair Value of Plan Assets (Detail) - Foreign Pension Benefits [Member] - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 323	$ 304
Accumulated benefit obligation	323	304
Fair value of plan assets	244	229
Funded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	253	235
Accumulated benefit obligation	253	235
Fair value of plan assets	244	229
Unfunded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	70	69
Accumulated benefit obligation	70	69
Fair value of plan assets	$ 0	$ 0

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920

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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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