|**(Fair Value Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions**                                                                                                                | Dec. 31, 2017                                                                                                                                                                                                                       | Mar. 31, 2017                                                                                                                                                                                                                      
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|Fair Value                                                                                                                                                                                                                              |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Total assets at fair value                                                                                                                                                                                                              |                                                                                                                                                                                                                                     | $ 3,299                                                                                                                                                                                                                            
|Total liabilities at fair value                                                                                                                                                                                                         |                                                                                                                                                                                                                                     | 174                                                                                                                                                                                                                                
|Quoted Prices In Active Markets For Identical Financial Instruments (Level 1)                                                                                                                                                           |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Total assets at fair value                                                                                                                                                                                                              |                                                                                                                                                                                                                                     | 1,318                                                                                                                                                                                                                              
|Total liabilities at fair value                                                                                                                                                                                                         |                                                                                                                                                                                                                                     | 11                                                                                                                                                                                                                                 
|Significant Other Observable Inputs (Level 2)                                                                                                                                                                                           |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Total assets at fair value                                                                                                                                                                                                              |                                                                                                                                                                                                                                     | 1,981                                                                                                                                                                                                                              
|Total liabilities at fair value                                                                                                                                                                                                         |                                                                                                                                                                                                                                     | 41                                                                                                                                                                                                                                 
|Fair Value, Inputs, Level 3 [Member]                                                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Total assets at fair value                                                                                                                                                                                                              |                                                                                                                                                                                                                                     | 0                                                                                                                                                                                                                                  
|Total liabilities at fair value                                                                                                                                                                                                         |                                                                                                                                                                                                                                     | 122                                                                                                                                                                                                                                
|Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. Treasury securities                                                                                                       |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 446                                                                                                                                                                                                                                
|Short-term investments | Significant Other Observable Inputs (Level 2) | Foreign Government Debt Securities [Member]                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Short-term investments | Significant Other Observable Inputs (Level 2) | Asset-backed Securities [Member]                                                                                                                               |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Asset-backed securities                                                                                                                                                                                                                 |                                                                                                                                                                                                                                     | 134                                                                                                                                                                                                                                
|Short-term investments | Significant Other Observable Inputs (Level 2) | Certificates of Deposit [Member]                                                                                                                               |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 22                                                                                                                                                                                                                                 
|Short-Term Investments And Cash Equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. Treasury securities                                                                                  |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Short-Term Investments And Cash Equivalents | Significant Other Observable Inputs (Level 2) | Corporate bonds                                                                                                                           |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 1,258                                                                                                                                                                                                                              
|Short-Term Investments And Cash Equivalents | Significant Other Observable Inputs (Level 2) | U.S. agency securities                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 118                                                                                                                                                                                                                                
|Short-Term Investments And Cash Equivalents | Significant Other Observable Inputs (Level 2) | Commercial paper                                                                                                                          |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 341                                                                                                                                                                                                                                
|Short-Term Investments And Cash Equivalents | Significant Other Observable Inputs (Level 2) | Foreign Government Debt Securities [Member]                                                                                               |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Available-for-sale of securities                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 100                                                                                                                                                                                                                                
|Cash Equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Bank Time Deposits [Member]                                                                                                          |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Cash equivalents                                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 299                                                                                                                                                                                                                                
|Cash Equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Money market funds                                                                                                                   |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Cash equivalents                                                                                                                                                                                                            |                                                                                                                                                                                                                                     | 563                                                                                                                                                                                                                                
|Other Current Assets and Other Assets [Domain] | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives                                                                                                           |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Foreign currency derivatives, assets                                                                                                                                                                                        |                                                                                                                                                                                                                                     | 8                                                                                                                                                                                                                                  
|Other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan assets                                                                                                        |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Deferred compensation plan assets                                                                                                                                                                                           | [1]                                                                                                                                                                                                                                 | 10                                                                                                                                                                                                                                 
|Accrued and Other Current Liabilities and Other Liabilities | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives                                                                                              |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Foreign currency derivatives, liabilities                                                                                                                                                                                   |                                                                                                                                                                                                                                     | 41                                                                                                                                                                                                                                 
|Other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred Compensation Plan Liabilities                                                                                              |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Fair value, Deferred compensation plan assets                                                                                                                                                                                           | [1]                                                                                                                                                                                                                                 | 11                                                                                                                                                                                                                                 
|Other liabilities | Fair Value, Inputs, Level 3 [Member] | Contingent consideration                                                                                                                                                     |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions**                                                                                                                                                                    |                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                    
|Accrued Liabilities, Fair Value Disclosure                                                                                                                                                                                              |                                                                                                                                                                                                                                     | $ 122                                                                                                                                                                                                                              
|                                                                                                                                                                                                                                       
|[1]
The Deferred Compensation Plan assets consist of various mutual funds. See Note 13 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017, for additional information regarding our Deferred Compensation Plan. | [1]                                                                                                                                                                                                                                 | The Deferred Compensation Plan assets consist of various mutual funds. See Note 13 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017, for additional information regarding our Deferred Compensation Plan.
|[1]                                                                                                                                                                                                                                     | The Deferred Compensation Plan assets consist of various mutual funds. See Note 13 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017, for additional information regarding our Deferred Compensation Plan.

X- DefinitionFair value portion of accrued expenses.
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instant X- DefinitionFair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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duration X- DefinitionThe fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.
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