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Long-term Debt (Issuance And Repurchase Of Notes) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 31, 2015
May. 02, 2015
Fixed Rate 6.875% Notes Due November 2035 [Member]    
Long-term Debt, Gross $ 1,000  
Debt instrument, stated rate 6.875%  
Proceeds from Issuance of Long-term Debt $ 988  
Debt Issuance Cost $ 12  
Adjustments for New Accounting Pronouncement [Member]    
Unamortized Debt Issuance Expense   $ 41