Discontinued Operations Net Income (Loss) from Discontinued Operations (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jul. 31, 2016 USD ($) business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue from discontinued operations		$ 56		$ 115
Net loss from discontinued operations	$ 0	$ 5	$ 0	$ 5
Demandforce, QuickBase, and Quicken
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses, net of cash divested					$ 463
Pre-tax gain on sale of discontinued operations					354
Net gain on disposal					$ 173
Number of businesses disposed | business					3