Related Party Transactions - Schedule of Amount of Receivables Due from and Payable to Related Parties (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Related Party Transactions [Abstract]
Accounts receivable from related parties	$ 8	$ 32
Accounts payable to related parties	$ 4	$ 17

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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