Discontinued Operations (Details) $ in Millions		12 Months Ended
		Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($) business	Jul. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses		$ 0	$ 463	$ 0
Pre-tax gain on sale of discontinued operations	[1]	$ 0	354	0
Discontinued Operations | Demandforce, QuickBase, and Quicken
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses			463
Pre-tax gain on sale of discontinued operations			354
Net gain on disposal of business			$ 173
Number of Business Disposed | business			3
Net revenue from discontinued operations			$ 137	236
Net income (loss) from discontinued operations			$ 173	$ (48)

[1] Because the cash flows of our discontinued operations were not material for any period presented, we have not segregated the cash flows of those businesses on these statements of cash flows. We have presented the effect of the pre-tax gains on the disposals on these statements of cash flows. See Note 6, “Discontinued Operations,” for more information.