|**Financial Instruments (Tables)**                                    | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|**Financial Instruments [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Fair Value Of Short-Term Investments                                  | Short-term investments consisted of the following as ofDecember 31, 2014andMarch 31, 2014(in millions):As of December 31, 2014As of March 31, 2014Cost orAmortizedCostGross UnrealizedFairValueCost orAmortizedCostGross UnrealizedFairValueGainsLossesGainsLossesCorporate bonds$399$—$(1)$398$279$—$—$279U.S. Treasury securities168——168114——114U.S. agency securities126——12680——80Commercial paper82——82110——110Short-term investments$775$—$(1)$774$583$—$—$583
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|                                                                      | As of December 31, 2014                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                      | Cost orAmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                      | Gains                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Corporate bonds                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|U.S. Treasury securities                                              | 168                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|U.S. agency securities                                                | 126                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Commercial paper                                                      | 82                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Short-term investments                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Fair Value Of Short-Term Investments By Stated Maturity Date Schedule | The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as ofDecember 31, 2014andMarch 31, 2014(in millions):As of December 31, 2014As of March 31, 2014AmortizedCostFairValueAmortizedCostFairValueShort-term investmentsDue in 1 year or less$363$363$318$318Due in 1-2 years208208156156Due in 2-3 years201200104104Due in 3-4 years3355Short-term investments$775$774$583$583              
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|                                                                      | As of December 31, 2014                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                      | AmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Short-term investments                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Due in 1 year or less                                                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Due in 1-2 years                                                      | 208                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Due in 2-3 years                                                      | 201                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Due in 3-4 years                                                      | 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Short-term investments                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

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