Taxes on Earnings Schedule Of Reconciliation Of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2017		Jul. 31, 2016	Aug. 02, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%		35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	2.10%		2.70%	2.20%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	(2.10%)		(3.00%)	(2.50%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent	0.00%		0.00%	(0.80%)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent	(2.10%)		(3.20%)	(2.90%)
Effective Income Tax Rate Reconciliation, Goodwill impairment, Percent	3.40%		4.30%	0.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.00%		(0.80%)	0.00%
Effective Income Tax Rate Reconciliation, Foreign Exchange Losses, Percent	(3.90%)	[1]	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.00%)		(1.30%)	(1.20%)
Effective Income Tax Rate Reconciliation, Percent	31.40%		33.70%	29.80%
Income Tax Expense (Benefit)	$ 406		$ 286	$ 283
Sale of Intercompany Notes [Member]
Income Tax Expense (Benefit)	$ (52)

[1] The 2017 rate was favorably impacted by a $52 benefit primarily related to the sale of intercompany notes receivable to a financial institution, which resulted in the recognition of foreign exchange losses.