Goodwill and Purchased Intangible Assets (Schedule of Intangible Assets Acquired Through Business Combinations) (Details) $ in Millions	3 Months Ended
	Oct. 27, 2018 USD ($) acquisition
Intangible Assets Acquired Through Business Combinations
Total, Amount	$ 350
Number of business combinations (acquisition) | acquisition	2
Duo
Intangible Assets Acquired Through Business Combinations
Total, Amount	$ 342
Other (one acquisition)
Intangible Assets Acquired Through Business Combinations
Total, Amount	$ 8
Number of business combinations (acquisition) | acquisition	1
IPR&D
Intangible Assets Acquired Through Business Combinations
Indefinite Lives, Amount	$ 77
IPR&D | Duo
Intangible Assets Acquired Through Business Combinations
Indefinite Lives, Amount	77
IPR&D | Other (one acquisition)
Intangible Assets Acquired Through Business Combinations
Indefinite Lives, Amount	0
TECHNOLOGY
Intangible Assets Acquired Through Business Combinations
Finite Lives, Amount	$ 161
TECHNOLOGY | Duo
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	5 years
Finite Lives, Amount	$ 153
TECHNOLOGY | Other (one acquisition)
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	5 years
Finite Lives, Amount	$ 8
CUSTOMER RELATIONSHIPS
Intangible Assets Acquired Through Business Combinations
Finite Lives, Amount	$ 94
CUSTOMER RELATIONSHIPS | Duo
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	5 years
Finite Lives, Amount	$ 94
CUSTOMER RELATIONSHIPS | Other (one acquisition)
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	0 years
Finite Lives, Amount	$ 0
OTHER
Intangible Assets Acquired Through Business Combinations
Finite Lives, Amount	$ 18
OTHER | Duo
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	2 years 6 months
Finite Lives, Amount	$ 18
OTHER | Other (one acquisition)
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)	0 years
Finite Lives, Amount	$ 0