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Basis of Presentation and Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May. 01, 2016
May. 03, 2015
May. 01, 2016
May. 03, 2015
Aug. 02, 2015
Aug. 04, 2014
Earnings retained in the business $ 2,105   $ 2,105   $ 1,754  
Inventories 829   829   995  
Accumulated other comprehensive loss (144)   (144)   (168)  
Other current assets 182   182   198  
Recognized net actuarial gains / (losses) (54) $ (26) (175) $ (26)    
Recognized net actuarial gains / (losses), net of tax $ (34) $ (16) $ (110) $ (16)    
Recognized net actuarial gains / (losses) net of tax, per diluted share $ (0.11) $ (0.05) $ (0.35) $ (0.05)    
Restatement adjustment [Member]            
Earnings retained in the business $ (766)   $ (766)   (740) $ (715)
Inventories 2   2   2 (2)
Accumulated other comprehensive loss 764   764   741 714
Other current assets $ (1)   $ (1)   $ (1) $ 1