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Financing Activities (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Oct. 29, 2016
Jul. 30, 2016
Jul. 30, 2016
Aug. 15, 2016
Subsequent Event [Line Items]        
Stock Repurchased During Period, Shares   0.0 3.0  
Stock Repurchased During Period, Value     $ 129  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 1,903 1,903  
Line of Credit Facility, Current Borrowing Capacity   1,500 1,500  
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,750 $ 1,750  
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Extinguishment of debt $ 108      
Debt Instrument, Interest Rate, Stated Percentage       7.875%