Pension And Postretirement Benefits Pension And Postretirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified		12 Months Ended					17 Months Ended	12 Months Ended						3 Months Ended		12 Months Ended	17 Months Ended
	Jul. 29, 2012	Jul. 29, 2012 Defined Contribution Pension [Member]	Jul. 31, 2011 Defined Contribution Pension [Member]	Aug. 01, 2010 Defined Contribution Pension [Member]	Jul. 29, 2012 Defined Contribution Pension [Member] Employees Not Covered By Collective Bargaining Agreements [Member]	Jul. 29, 2012 Defined Contribution Pension [Member] Employees Not Eligible To Participate In Defined Benefit Plans And Who Are Not Covered By Collective Bargaining Agreements [Member]	Dec. 31, 2010 Defined Contribution Pension [Member] Employees Not Eligible To Participate In Defined Benefit Plans And Who Are Not Covered By Collective Bargaining Agreements [Member]	Jul. 29, 2012 Pension Plans, Defined Benefit [Member]	Jul. 31, 2011 Pension Plans, Defined Benefit [Member]	Aug. 01, 2010 Pension Plans, Defined Benefit [Member]	Jul. 29, 2012 Other Postretirement Benefit Plans, Defined Benefit [Member]	Jul. 31, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Aug. 01, 2010 Other Postretirement Benefit Plans, Defined Benefit [Member]	Oct. 28, 2012 U.S. Pension Plans [Member]	Jul. 29, 2012 Non U.S. Pension Plans [Member]	Jul. 29, 2012 Maximum [Member] Defined Contribution Pension [Member] Employees Not Covered By Collective Bargaining Agreements [Member]	Dec. 31, 2010 Maximum [Member] Defined Contribution Pension [Member] 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 Benefit Plan, Amortization of Net Prior Service Cost (Credit)								$ (1)			$ (1)
Contributions to pension plans								71	144					75
Reclassification of net actuarial losses into earnings								108			15
Discount rate								5.41%	5.46%	6.00%	5.00%	5.25%	6.00%
Accumulated benefit obligation								2,657	2,299
Reclassification of actuarial losses into earnings								74	70	49	9	7	1
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year															13
Estimated future Medicare subsidy receipts, 2013	1
Matching contribution percentage					100.00%		60.00%
Employer matching contribution percentage						3.00%										4.00%	5.00%
Matching contribution percentage certain locations							50.00%
Matching contribution, employer expense		$ 24	$ 20	$ 17