Segment Information (Revenue and Property and Equipment, net by Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 31,384	$ 30,662	$ 31,445	$ 28,055	$ 27,547	$ 25,375	$ 25,537	$ 24,070	$ 121,546	$ 102,531	$ 91,084
Property and equipment, net	1,796				1,506				1,796	1,506	1,459
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									116,864	98,435	87,449
Property and equipment, net	1,558				1,327				1,558	1,327	1,301
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									4,682	4,096	3,635
Property and equipment, net	$ 238				$ 179				$ 238	$ 179	$ 158