Acquisitions (Details) (USD $) In Millions, unless otherwise specified				10 Months Ended			10 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 Layer 7 [Member]		Jun. 30, 2013 Layer 7 [Member]	Mar. 31, 2014 Layer 7 [Member] Purchased Software [Member]	Mar. 31, 2013 Nolio [Member]		Mar. 31, 2013 Nolio [Member] Purchased Software [Member]	Aug. 31, 2011 ITKO [Member]
Business Combinations [Abstract]
Accrued acquisition-related costs related to purchase price amounts withheld to support indemnification obligations	$ 30	$ 14
Allocation of purchase price and estimated useful lives by acquisition
Percentage of voting equity interest acquired						100.00%		100.00%			100.00%
Finite-lived intangible assets				26	[1]		87	8	[1]	33
Goodwill	5,922	5,864	5,856	55				10
Deferred tax liabilities				(13)				(9)
Other assets net of other liabilities assumed				0	[2]
Purchase price				155		155		42			315
Cash acquired from acquisition				$ 9
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)				3 years	[1]		5 years
Goodwill, Estimated useful life				Indefinite

[1] Includes customer relationships and trade names.

[2] Includes approximately $9 million of cash acquired.