Taxes on Earnings Schedule of Activity Related to Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 32	$ 64	$ 63
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	1	0	4
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(1)	(37)	0
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	2	2	4
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(9)	(1)	(7)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(1)	0	0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	4	0
Unrecognized Tax Benefits	$ 24	$ 32	$ 64