Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Commitments and Contingencies [Line Items]
Assets recorded under capital leases	$ 1,900		$ 1,900		$ 865
Accumulated depreciation associated with capital leases	124		124		57
Property and equipment acquired under capital leases	296	$ 97	1,100	$ 97
Accrual for disclosed loss contingencies, current, ending balance	443		443
Amount not accrued for estimated maximum losses for disclosed loss contingencies	1,500		1,500
Capital Leases
Commitments and Contingencies [Line Items]
Additional purchase obligations for capital leases executed but not yet recorded	4,100		4,100
Other Current Liabilities
Commitments and Contingencies [Line Items]
Current capital lease obligations	86		86		25
Other Long-term Liabilities
Commitments and Contingencies [Line Items]
Long-term capital lease obligations	$ 1,700		$ 1,700		$ 761