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Background, Merger And Basis Of Presentation (Details)
$ in Millions
6 Months Ended 9 Months Ended
Apr. 01, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 05, 2012
USD ($)
Dec. 18, 2009
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2015
segments
Jun. 30, 2014
Partner
segments
General Disclosures [Line Items]              
Number of Operating Segments | segments           3  
Number of channel partners worldwide | Partner             11,300
Nortel Networks              
General Disclosures [Line Items]              
Business Combination, Consideration Transferred       $ 933      
RADVISION Ltd | Parent Company              
General Disclosures [Line Items]              
Business Combination, Consideration Transferred     $ 230        
Product Portfolio              
General Disclosures [Line Items]              
Number of Operating Segments | segments             2
government IT Professional Services business              
General Disclosures [Line Items]              
Proceeds from divestiture of businesses   $ 98     $ 101    
Gain (loss) on disposition of business $ 3            
Transaction costs   $ 2     $ 2