Debt - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Debt Instrument [Line Items]
Commercial paper	$ 9,100,000,000	$ 12,900,000,000
Credit facility, financial covenant	As of June 30, 2017, we were in compliance with the only financial covenant in both credit agreements, which requires us to maintain a coverage ratio of at least three times earnings before interest, taxes, depreciation, and amortization to interest expense, as defined in the credit agreements.
Credit facility, drawn	$ 0	0
Long-term debt	77,100,000,000	40,600,000,000
Long-term debt fair value	80,300,000,000	44,000,000,000
Cash paid for interest	1,600,000,000	1,100,000,000	$ 620,000,000
Unamortized discount and debt issuance costs	715,000,000	$ 392,000,000
Credit Facility Expire on October 31st 2017
Debt Instrument [Line Items]
Credit facility	$ 5,000,000,000
Credit facility, expiration date	Oct. 31, 2017
Credit Facility Expire on November 14th 2018
Debt Instrument [Line Items]
Credit facility	$ 5,000,000,000
Credit facility, expiration date	Nov. 14, 2018
Commercial paper
Debt Instrument [Line Items]
Commercial paper, weighted average interest rate	1.01%	0.43%
Commercial paper | Lower Limit
Debt Instrument [Line Items]
Commercial paper, maturity term	25 days	1 day
Commercial paper | Upper Limit
Debt Instrument [Line Items]
Commercial paper, maturity term	264 days	99 days