Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Commitments and Contingencies [Line Items]
Assets recorded under capital leases	$ 1,600		$ 1,600		$ 865
Accumulated depreciation associated with capital leases	95		95		57
Property and equipment acquired under capital leases	498	$ 0	765	$ 0
Additional purchase obligations for capital leases executed but not yet recorded	4,200		4,200
Accrual for disclosed loss contingencies, current, ending balance	415		415
Amount not accrued for estimated maximum losses for disclosed loss contingencies	1,500		1,500
Other Current Liabilities
Commitments and Contingencies [Line Items]
Current capital lease obligations	56		56		25
Other Long-term Liabilities
Commitments and Contingencies [Line Items]
Long-term capital lease obligations	$ 1,500		$ 1,500		$ 761