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Variable Interest Entity (Details) - USD ($)
$ in Millions
6 Months Ended
Jan. 29, 2017
Jul. 31, 2016
Feb. 29, 2016
LLC ownership percentage 99.80%    
Investments funded $ 51    
Other assets 120 $ 107  
Variable Interest Entity      
Other assets 47 $ 34  
Total Commitment [Member]      
Other Commitment     $ 125
Remaining Commitment [Member]      
Other Commitment $ 74