Goodwill and Purchased Intangible Assets (Schedule Of Intangible Assets Acquired Through Business Combinations) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Apr. 29, 2017 USD ($) acquisition	Apr. 29, 2017 USD ($) acquisition
Intangible Assets Acquired Through Business Combinations
Number of business combinations | acquisition		4
Total, Amount	$ 826	$ 826
CloudLock
Intangible Assets Acquired Through Business Combinations
Total, Amount	36	36
AppDynamics
Intangible Assets Acquired Through Business Combinations
Total, Amount	$ 785	$ 785
Others (two in total)
Intangible Assets Acquired Through Business Combinations
Number of business combinations | acquisition	2	2
Total, Amount	$ 5	$ 5
IPR&D
Intangible Assets Acquired Through Business Combinations
Indefinite Lives, Amount		0
IPR&D | CloudLock
Intangible Assets Acquired Through Business Combinations
Indefinite Lives, Amount		0
IPR&D | Others (two in total)
Intangible Assets Acquired Through Business Combinations
Indefinite Lives, Amount		0
TECHNOLOGY
Intangible Assets Acquired Through Business Combinations
Finite Lives, Amount		$ 562
TECHNOLOGY | CloudLock
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		6 years
Finite Lives, Amount		$ 32
TECHNOLOGY | AppDynamics
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		4 years
Finite Lives, Amount		$ 525
TECHNOLOGY | Others (two in total)
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		3 years
Finite Lives, Amount		$ 5
CUSTOMER RELATIONSHIPS
Intangible Assets Acquired Through Business Combinations
Finite Lives, Amount		$ 238
CUSTOMER RELATIONSHIPS | CloudLock
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		4 years
Finite Lives, Amount		$ 3
CUSTOMER RELATIONSHIPS | AppDynamics
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		7 years
Finite Lives, Amount		$ 235
CUSTOMER RELATIONSHIPS | Others (two in total)
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		$ 26
OTHER | CloudLock
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		1 year 6 months
Finite Lives, Amount		$ 1
OTHER | AppDynamics
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		2 years 3 months 25 days
Finite Lives, Amount		$ 25
OTHER | Others (two in total)
Intangible Assets Acquired Through Business Combinations
Weighted- Average Useful Life (in Years)		0 years
Finite Lives, Amount		$ 0