Pension And Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
		Jul. 01, 2011	Aug. 02, 2015	Aug. 03, 2014	Jul. 28, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reclassification of net actuarial loss included in net earnings before tax	[1]		$ 98	$ 113	$ 124
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		60.00%
Defined Contribution Plan, Cost Recognized			$ 31	29	27
Employees Not Covered By Collective Bargaining Agreements [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			4.00%
Employees Not Eligible To Participate In Defined Benefit Plans And Who Are Not Covered By Collective Bargaining Agreements [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			3.00%
At certain locations [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		5.00%
Discontinued Operations [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reclassification of net actuarial loss included in net earnings before tax	[1]		$ 2
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments			(1)	0	(3)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements			0	(22)	0
Defined Benefit Plan, Net Periodic Benefit Cost			44	78	$ 98
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)			(1)
Defined Benefit Plan, Future Amortization of Gain (Loss)			(90)
Reclassification of net actuarial loss included in net earnings before tax			84	100
Defined Benefit Plan, Accumulated Benefit Obligation			$ 2,516	$ 2,477
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			4.33%	4.82%	4.05%
Pension Plan, Defined Benefit [Member] | Discontinued Operations [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost					$ 1
Reclassification of net actuarial loss included in net earnings before tax				$ 2
Pension Plan, Defined Benefit [Member] | Corporate, Non-Segment [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements				(22)
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments			$ (6)	0	0
Defined Benefit Plan, Net Periodic Benefit Cost			36	31	$ 32
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)			(1)
Defined Benefit Plan, Future Amortization of Gain (Loss)			(13)
Reclassification of net actuarial loss included in net earnings before tax			$ 14	$ 13
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			4.00%	4.50%	3.75%
U.S. Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year			$ 0
Non-U.S. Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year			$ 5

[1] In 2014, net actuarial losses of $2 were recognized in Earnings (loss) from discontinued operations as a result of the sale of the European simple meals business. Excluding the net actuarial losses related to the sale of the business in 2014, these items are included in the components of net periodic benefit costs (see Note 11 for additional details).