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Financial Instruments (Carrying Value And Fair Value Of Convertible Senior Notes) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Financial Instruments    
Convertible Senior Notes, Carrying Value $ 591 $ 580 [1]
Convertible Debt
   
Financial Instruments    
Convertible Senior Notes, Fair Value $ 787 $ 731
[1] Derived from audited consolidated financial statements.