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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2016
Oct. 31, 2016
Oct. 31, 2015
Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock repurchased (in shares)   1.8 14.4  
Common stock repurchased, value   $ 192 $ 1,270  
Amounts due for share repurchases   $ 17   $ 0
Common stock, dividends, per share, cash paid (in USD per share)   $ 0.34    
Payments of dividends   $ 89 $ 82  
Cash dividends declared per common share (in USD per share)   $ 0.34 $ 0.30  
Allocated share-based compensation expense   $ 89 $ 67  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non-vested share based compensation expense   $ 73    
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years   2 years 3 months    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non-vested share based compensation expense   $ 536    
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years   2 years 3 months    
Discontinued Operations, Disposed of by Sale        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense     2  
Software and Software Development Costs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capitalized computer software, gross   $ 2 $ 2  
Subsequent event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash dividends declared per common share (in USD per share) $ 0.34      
New Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, remaining authorized repurchase amount   $ 2,200