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Variable Interest Entity (Details) - USD ($)
$ in Millions
6 Months Ended
Jan. 28, 2018
Jul. 30, 2017
Feb. 29, 2016
Investments funded $ 71    
Other assets 146 $ 139  
Variable Interest Entity      
Other assets 70 $ 51  
Total Commitment [Member]      
Other Commitment     $ 125
Remaining Commitment [Member]      
Other Commitment $ 54    
Acre Venture Partners [Member]      
LLC ownership percentage 99.80%