Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Significant Accounting Policies [Line Items]
Revenue	$ 22,090	$ 20,531	$ 66,633	$ 64,706
Accounting Standards Update 2016-02 | Scenario Plan
Significant Accounting Policies [Line Items]
Recognition of additional ROU assets for operating leases					$ 5,000
Recognition of additional lease liabilities for operating leases					5,000
Accounting Standards Update 2014-09 | Scenario Plan
Significant Accounting Policies [Line Items]
Revenue					$ 6,000