Income Taxes - Summary of Recognized Deferred Income Taxes in Balance Sheets (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Deferred income tax assets	$ 332	$ 269
Deferred income tax liabilities	(258)	(295)
Net deferred tax assets (liabilities)	$ 74
Net deferred tax assets (liabilities)		$ (26)

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e31931-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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-Publisher FASB
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