Revenues - Summary of Deferred Revenue from Contract with Customers (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2019	Mar. 31, 2019
Deferred Revenue Arrangement [Line Items]
Recognition of deferred revenue	$ 883	$ 2,300
Deferred Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Recognition of deferred revenue	$ 241	$ 461

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration