|**Financial Instruments (Tables)**                                    | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|**Financial Instruments [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Fair Value Of Short-Term Investments                                  | Short-term investments consisted of the following as ofMarch 31, 2016 and 2015(in millions):As of March 31, 2016As of March 31, 2015Cost orAmortizedCostGross UnrealizedFairValueCost orAmortizedCostGross UnrealizedFairValueGainsLossesGainsLossesCorporate bonds$733$1$—$734$467$—$—$467U.S. Treasury securities3891—390214——214U.S. agency securities167——1671611—162Commercial paper50——50110——110Short-term investments$1,339$2$—$1,341$952$1$—$953
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|                                                                      | As of March 31, 2016                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                      | Cost orAmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                      | Gains                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Corporate bonds                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|U.S. Treasury securities                                              | 389                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|U.S. agency securities                                                | 167                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Commercial paper                                                      | 50                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|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 ofMarch 31, 2016 and 2015(in millions):As of March 31, 2016As of March 31, 2015AmortizedCostFairValueAmortizedCostFairValueShort-term investmentsDue in 1 year or less$571$571$417$417Due in 1-2 years461462281281Due in 2-3 years295296244245Due in 3-4 years12121010Short-term investments$1,339$1,341$952$953        
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|                                                                      | As of March 31, 2016                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                      | AmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Short-term investments                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Due in 1 year or less                                                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Due in 1-2 years                                                      | 461                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Due in 2-3 years                                                      | 295                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Due in 3-4 years                                                      | 12                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Short-term investments                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                        

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