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Commitments and Contingencies (Schedule of Purchase Commitments) (Details) - USD ($)
$ in Millions
Jan. 27, 2018
Jul. 29, 2017
Commitments and Contingencies Disclosure [Abstract]    
Less than 1 year $ 4,498 $ 4,620
1 to 3 years 690 20
3 to 5 years 540 0
Total $ 5,728 $ 4,640