|**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 (in millions):As of June 30, 2018As of March 31, 2018Notional AmountFair ValueNotional AmountFair ValueAssetLiabilityAssetLiabilityForward contracts to purchase$224$—$13$329$2$4Forward contracts to sell$1,352$59$3$1,575$1$48                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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|                                                                                    | As of June 30, 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                    | Notional Amount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Forward contracts to purchase                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Forward contracts to sell                                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Derivatives Not Designated as Hedging Instruments [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 June 30, 2018As of March 31, 2018Notional AmountFair ValueNotional AmountFair ValueAssetLiabilityAssetLiabilityForward contracts to purchase$249$—$1$210$1$1Forward contracts to sell$241$—$—$257$—$3The effect of foreign currency forward contracts not designated as hedging instruments in our Condensed Consolidated Statements of Operations for thethree months ended June 30, 2018 and 2017was as follows (in millions):Statement of Operations ClassificationAmount of Gain (Loss) Recognized in the Statement of OperationsThree Months Ended June 30,20182017Foreign currency forward contracts not designated as hedging instrumentsInterest and other income (expense), net$9$(6)
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|                                                                                    | As of June 30, 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                    | Notional Amount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Forward contracts to purchase                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Forward contracts to sell                                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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|                                                                                    | Statement of Operations Classification                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                    | Three Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                    | 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Foreign currency forward contracts not designated as hedging instruments            | Interest and other income (expense), net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

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