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Other Income (Expense), Net - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Other Income and Expenses [Abstract]      
Interest Income, Gross Receipts Tax $ 3    
Foreign Currency Devaluation Gain (Loss)   $ (6) $ 4