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Variable Interest Entity (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 08, 2020
Apr. 26, 2020
Aug. 02, 2020
Jul. 28, 2019
Jul. 29, 2018
Feb. 29, 2016
Investments funded $ 86          
Other assets     $ 283 $ 127    
Proceeds from sale of investment $ 30   30 0 $ 0  
Investment losses   $ 45 $ 49 [1] 1 [1] $ 10 [1]  
Variable Interest Entity, Primary Beneficiary [Member]            
Other assets       $ 76    
Total Commitment [Member]            
Other Commitment           $ 125
Acre Venture Partners [Member]            
LLC ownership percentage 99.80%          
[1] 2020 includes a loss of $45 related to Acre. See Note 16 for additional information.