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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
4 Months Ended 4 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Layer 7 [Member]
Jun. 30, 2013
Layer 7 [Member]
Sep. 30, 2013
Layer 7 [Member]
Purchased Software [Member]
Allocation of purchase price and estimated useful lives by acquisition          
Percentage of voting equity interest acquired       100.00%  
Finite-lived intangible assets     $ 12 [1]    
Purchased software     99    
Goodwill     54    
Deferred tax liabilities     (14)    
Other assets net of other liabilities assumed     4 [2]    
Purchase price     155 155  
Cash acquired from acquisition     9    
Estimated Useful Life [Abstract]          
Finite-lived intangible assets, Estimated useful life     5 years [1]   5 years
Goodwill, Estimated useful life     Indefinite    
Acquisitions (Textual) [Abstract]          
Accrued acquisition-related costs related to purchase price amounts withheld to support indemnification obligations $ 34 $ 14      
[1] Includes customer relationships and trade names.
[2] Includes approximately $9 million of cash acquired.