Segment Information (Revenue and Property and Equipment, net by Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 32,966	$ 31,821	$ 33,150	$ 32,039	$ 31,384	$ 30,662	$ 31,445	$ 28,055	$ 129,976	$ 121,546	$ 102,531
Property and equipment, net	1,879				1,796				1,879	1,796	1,506
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									125,006	116,864	98,435
Property and equipment, net	1,623				1,558				1,623	1,558	1,327
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									4,970	4,682	4,096
Property and equipment, net	$ 256				$ 238				$ 256	$ 238	$ 179