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Scitor Acquisition (Detail 1)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
May. 04, 2015
USD ($)
Employees
Aug. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Jan. 30, 2015
USD ($)
Aug. 01, 2014
USD ($)
Jul. 31, 2015
USD ($)
Aug. 01, 2014
USD ($)
Jul. 31, 2015
USD ($)
Business Acquisition [Line Items]                
Purchase consideration paid, net of cash acquired           $ 764    
Deferred financing fees           17    
Revenues     $ 1,099   $ 952 2,108 $ 1,929  
Net income     22   $ 34 $ 55 $ 68  
Scitor Holdings, Inc.                
Business Acquisition [Line Items]                
Date of acquisition           May 04, 2015    
Number of employees increased due to acquisition | Employees 1,500              
Purchase consideration paid, net of cash acquired $ 764              
Amount deposited to adjustment and indemnification escrow accounts included in cash consideration paid $ 43              
Acquisition expenses     8 $ 1   $ 10   $ 33
Deferred financing fees           17    
Integration costs     4     5    
Revenues     147     147    
Net income     $ 2     $ 2    
Scitor Holdings, Inc. | Subsequent Event                
Business Acquisition [Line Items]                
Amount released from escrow account on settlement of working capital adjustment   $ 3