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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Millions
Aug. 01, 2016
Jul. 31, 2016
Cumulative effect of change in accounting principle $ 2  
Retained Earnings    
Cumulative effect of change in accounting principle $ (4)  
Accounting Standards Update 2014-09 | Retained Earnings    
Cumulative effect of change in accounting principle   $ 331