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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
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
2014 $ 74  
2015 66  
2016 53  
2017 32  
2018 13  
Thereafter 15  
Total $ 253 $ 369