Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, beginning of period	$ 361	$ 409	$ 289
Charged to costs and other	134	58	175
Write-offs	(98)	(106)	(55)
Balance, end of period	397	361	409
Accounts receivable, net of allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, beginning of period	345	392
Balance, end of period	377	345	392
Other Long-term Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, beginning of period	16	17
Balance, end of period	$ 20	$ 16	$ 17