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Discontinued Operations Net Income (Loss) from Discontinued Operations (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Jul. 31, 2016
USD ($)
business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Pre-tax gain on sale of discontinued operations     $ 0 $ 354  
Net revenue from discontinued operations   $ 22   137  
Net income from discontinued operations $ 0 $ 178 $ 0 $ 173  
Demandforce, QuickBase, and Quicken          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of businesses disposed | business         3
Discontinued Operations, Disposed of by Sale | 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