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Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Future Amortization Of Acquisition-Related Intangibles) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2014 (remaining six months) $ 37  
2015 66  
2016 53  
2017 32  
2018 13  
2019 8  
Thereafter 7  
Total $ 216 $ 253 [1]
[1] Derived from audited consolidated financial statements.