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Pension And Postretirement Benefits (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2011
Dec. 31, 2010
Aug. 01, 2010
Aug. 02, 2009
Jul. 31, 2011
Pension [Member]
Aug. 01, 2010
Pension [Member]
Aug. 02, 2009
Pension [Member]
Jul. 31, 2011
Postretirement [Member]
Aug. 01, 2010
Postretirement [Member]
Aug. 02, 2009
Postretirement [Member]
Oct. 30, 2011
U.S. Pension Plans [Member]
Jul. 31, 2011
U.S. Pension Plans [Member]
Jul. 31, 2011
Non U.S. Pension Plans [Member]
Jul. 31, 2011
Employees Not Covered By Collective Bargaining Agreements [Member]
Jul. 31, 2011
Employees Not Eligible To Participate In Defined Benefit Plans And Who Are Not Covered By Collective Bargaining Agreements [Member]
Reclassification of actuarial losses into earnings         $ 75     $ 9              
Estimated prior service cost (credit) to be amortized               (1)              
Actuarial loss arising during period                 50            
Prior service credit arising during period                 18            
Reclassification of actuarial losses into earnings         70 49 19 7 1            
Accumulated benefit obligation         2,299 2,148                  
Discount rate used to determine net periodic postretirement expense         5.46% 6.00% 6.87% 5.25% 6.00% 7.00%          
Contribution to pension plans 144   284               55        
Expected contribution to pension plan for fiscal year 2012                       0 10    
Estimated future Medicare subsidy receipts, 2012 3                            
Estimated future Medicare subsidy receipts, 2013 3                            
Estimated future Medicare subsidy receipts, 2014 3                            
Estimated future Medicare subsidy receipts, 2015 3                            
Estimated future Medicare subsidy receipts, 2016 3                            
Estimated future Medicare subsidy receipts, five years thereafter 15                            
Matching contribution percentage   60.00%                       100.00%  
Maximum employer matching contribution percentage   5.00%                       4.00% 3.00%
Matching contribution percentage certain locations   50.00%                          
Matching contribution, employer expense $ 20   $ 17 $ 18