Divestitures 2 (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	1 Months Ended
	Sep. 30, 2014	Jul. 31, 2014 Arcserve [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued component		$ 170
Gain on disposal of discontinued component, net of tax		19
Tax expense related to gain on disposal of discontinued component		77
Goodwill written off related to sale of discontinued component	$ 109	$ 109