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Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 03, 2014
Apr. 27, 2014
Jan. 26, 2014
Oct. 27, 2013
Aug. 02, 2015
Aug. 03, 2014
Jul. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Earnings (loss) from discontinued operations $ 0 $ 0 $ 90 $ (9) $ 0 $ 81 $ (231)
Discontinued Operations [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net sales           137 532
Gain on sale of business           141 0
Impairment of long-lived assets to be disposed of           0 (396)
Earnings from discontinued operations, before tax           14 65
Earnings before taxes           155 (331)
Taxes on earnings           (74) 100
Earnings (loss) from discontinued operations           $ 81 $ (231)