XML 26 R78.htm IDEA: XBRL DOCUMENT v3.2.0.727
Investments (Additional Information) (Details) - USD ($)
9 Months Ended 12 Months Ended 69 Months Ended
Apr. 25, 2015
Jul. 25, 2015
Jul. 26, 2014
Jul. 27, 2013
Apr. 25, 2015
Oct. 25, 2014
Schedule of Investments [Line Items]            
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount   $ 0 $ 11,000,000 $ 0    
Other than temporary impairment, credit losses recognized in earnings, credit losses on debt securities held   0        
Average daily balance of securities lending   $ 400,000,000 1,500,000,000      
Minimum market value percentage for collateral on loaned securities   102.00%        
Secured lending transactions outstanding   $ 0 0      
Cost method investments   319,000,000 269,000,000      
VCE            
Schedule of Investments [Line Items]            
Cumulative gross investment in VCE $ 716,000,000       $ 716,000,000  
Losses from VCE 47,000,000   $ 223,000,000 $ 183,000,000 691,000,000  
Proceeds from Sale of Equity Method Investment $ 152,000,000       $ 152,000,000  
Equity Method Investment, Ownership Percentage           35.00%
Ownership interest in cost method investment 10.00%       10.00%  
Cost method investments   $ 0        
Gains recognized related to restructuring of VCE $ 126,000,000