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Share Repurchase - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended
Apr. 30, 2016
Aug. 01, 2015
May. 02, 2015
Aug. 01, 2015
Apr. 30, 2016
Jan. 30, 2016
Jun. 30, 2015
Loss Contingencies [Line Items]              
Cumulative shares of common stock repurchased (in shares) 11.4   3.7        
Total investment $ 893,000,000   $ 300,000,000        
Shares delivered upon noncash settlement     0.1        
Total cash investment $ 893,000,000         $ 3,445,000,000  
Repurchase of Share Repurchase Program 2015              
Loss Contingencies [Line Items]              
Authorized expansion amount of existing share repurchase program             $ 5,000,000,000
New amount of existing share repurchase program             $ 10,000,000,000
Cumulative shares of common stock repurchased (in shares)         106.0    
Price per share (in dollars per share)         $ 70.51    
Total investment         $ 7,500,000,000    
Cash Investment              
Loss Contingencies [Line Items]              
Total cash investment     $ 3,000,000        
Prepaid Forward Contracts Market Value              
Loss Contingencies [Line Items]              
Aggregate market value     $ 7,000,000        
Accelerated Share Repurchase              
Loss Contingencies [Line Items]              
Price per share (in dollars per share)       $ 80.74      
Total cash investment       $ 265,000,000      
Shares retired   1.1 2.2