|**Derivative Financial Instruments (Tables)**                                                                                                                | 9 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 (in millions):As of December 31, 2016As of March 31, 2016Notional AmountFair ValueNotional AmountFair ValueAssetLiabilityAssetLiabilityForward contracts to purchase$177$—$8$148$5$1Forward contracts to sell$700$44$1$685$11$9                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
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|                                                                                                                                                             | As of December 31, 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                                                             | 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 (in millions):As of December 31, 2016As of March 31, 2016Notional AmountFair ValueNotional AmountFair ValueAssetLiabilityAssetLiabilityForward contracts to purchase$143$—$1$108$—$—Forward contracts to sell$681$13$—$159$—$—The effect of foreign currency forward contracts not designated as hedging instruments in our Condensed Consolidated Statements of Operations for thethree and nine months ended December 31, 2016 and 2015, was as follows (in millions):Statement of Operations ClassificationAmount of Gain (Loss) Recognized in the Statement of OperationsThree Months Ended December 31,Nine Months Ended December 31,2016201520162015Foreign currency forward contracts not designated as hedging instrumentsInterest and other income (expense), net$49$13$50$15
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|                                                                                                                                                             | As of December 31, 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                                                             | Notional Amount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Forward contracts to purchase                                                                                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Forward contracts to sell                                                                                                                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|                                                                                                                                                             | Statement of Operations Classification                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                                                                                             | Three Months Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                                             | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign currency forward contracts not designated as hedging instruments                                                                                     | Interest and other income (expense), net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                

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