|**Derivative Financial Instruments Derivative Financial Instruments (Tables)**                                                                               | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|**Derivative Financial Instruments [Abstract]**                                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]                                                                          | Total gross notional amounts and fair values for currency derivatives with cash flow hedge accounting designation are as follows:As of June 30, 2015As of March 31, 2015Notional AmountFair ValueNotional AmountFair ValueAssetLiabilityAssetLiabilityForward contracts to purchase$70$—$3$108$—$8Forward contracts to sell$679$8$9$508$18$1                                                                                                                                                                                                                                                                                        
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|                                                                                                                                                             | As of June 30, 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                                                             | Notional Amount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Forward contracts to purchase                                                                                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Forward contracts to sell                                                                                                                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | Total gross notional amounts and fair values for currency derivatives that are not designated as hedging instruments are accounted for as follows:As of June 30, 2015As of March 31, 2015Notional AmountFair ValueNotional AmountFair ValueAssetLiabilityAssetLiabilityForward contracts to purchase$79$—$—$99$—$—Forward contracts to sell$98$1$—$173$—$—The effect of foreign currency forward contracts not designated as hedging instruments in our Condensed Consolidated Statements of Operations for thethree months ended June 30, 2015 and 2014was immaterial, and is included in interest and other income (expense), net.
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|                                                                                                                                                             | As of June 30, 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                                                             | Notional Amount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Forward contracts to purchase                                                                                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Forward contracts to sell                                                                                                                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

X- DefinitionDerivative Financial Instruments [Abstract]
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