Divestitures Narrative (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended	9 Months Ended
	Jul. 31, 2014	Apr. 01, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
government IT Professional Services business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses			$ 98			$ 101
Transaction costs			$ 2			$ 2
Gain (loss) on disposition of business		$ 3
Technology Business Unit (TBU)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses	$ 26
Other Income | Foreign currency forward contracts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on foreign currency contracts included in other income (expense)				$ (4)	$ 2		$ (5)	$ 4