Investments - Additional Information (Detail) - USD ($) $ in Billions	Dec. 31, 2019	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Equity investments without readily determinable fair values measured at cost with adjustments for observable changes in price or impairments	$ 1.3	$ 1.2

Amount of investment in equity security without readily determinable fair value.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

Name:	us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant