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Taxes On Earnings (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended
Jul. 29, 2012
Jul. 31, 2011
Aug. 01, 2010
Jul. 29, 2012
Minimum [Member]
Jul. 29, 2012
Maximum [Member]
Jul. 29, 2012
Non-U.S. [Member]
Jul. 29, 2012
United States [Member]
Jul. 29, 2012
United States [Member]
Minimum [Member]
Jul. 29, 2012
United States [Member]
Maximum [Member]
Jul. 29, 2012
Domestic Country [Member]
Maximum [Member]
May 02, 2010
U.S. Health Care Legislation [Member]
Jul. 29, 2012
Foreign Country [Member]
Minimum [Member]
Jul. 29, 2012
Tax Loss Carryfowards Expiring 2013 To 2028 [Member]
Jul. 29, 2012
Tax Loss Carryfowards Indefinitely [Member]
Jul. 29, 2012
Accured Income Tax [Member]
Tax benefit recorded   $ 8 $ 9                        
Deferred tax expense                     10        
Additional tax benefit recorded     2                        
Tax loss carryforward 317                       106 211  
Tax loss carryforward, expiration date       2013 2028                    
Statutory tax rate 35.00% 35.00% 35.00%             35.00%   15.00%      
Tax loss carryforward, valuation allowance 83                            
Capital loss carryforwards           388 2                
Valuation allowance increase (decrease) (14) 33 15                        
Deferred Tax Assets, Tax Credit Carryforwards, Foreign           3                  
Tax Credit Carryforward, Expiration Dates           2022   2014 2021            
Deferred Tax Assets, Tax Credit Carryforwards, Other 3                            
Undistributed earning of non-U.S. subsidiaries deemed permanently reinvested 561                            
Unrecognized tax benefits 18 17 22                        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 17                            
Interest and penalties recognized in Consolidated Balance Sheets, recognized 8 8                          
Unrecognized Tax Benefits Reserves Tax Penalties And Accrued Interest $ 50 $ 51                         $ 6