| **Fair Value Measurements (Fair Value of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions**                         | Mar. 31, 2022 | Mar. 31, 2021 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| Fair Value                                                                                                                                                               |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Total assets at fair value                                                                                                                                               | $ 740         | $ 3,490       |
| Total liabilities at fair value                                                                                                                                          | 36            | 59            |
| Fair value, Available-for-sale of securities                                                                                                                             | 330           | 1,106         |
| Quoted Prices In Active Markets For Identical Financial Instruments (Level 1)                                                                                            |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Total assets at fair value                                                                                                                                               | 437           | 2,712         |
| Total liabilities at fair value                                                                                                                                          | 22            | 19            |
| Significant Other Observable Inputs (Level 2) [Member]                                                                                                                   |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Total assets at fair value                                                                                                                                               | 303           | 778           |
| Total liabilities at fair value                                                                                                                                          | 14            | 40            |
| Fair Value, Inputs, Level 3 [Member]                                                                                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Total assets at fair value                                                                                                                                               | 0             | 0             |
| Total liabilities at fair value                                                                                                                                          | 0             | 0             |
| Short-Term Investments [Member] | Debt Security, Government, Non-US [Member] | Fair Value                                                                                |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 17            |          |
| Short-Term Investments [Member] | Certificates of Deposit [Member] | Fair Value                                                                                          |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 18            |          |
| Short-Term Investments [Member] | Asset-backed Securities [Member] | Fair Value                                                                                          |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value                                                                      | 38            |          |
| Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | US Agencies Securities [Member]                                               |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             |          | 3             |
| Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Security, Government, Non-US [Member]                                    |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 17            | 67            |
| Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]                                              |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 18            | 41            |
| Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Asset-backed Securities [Member]                                              |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value                                                                      | 38            | 112           |
| Short-Term Investments And Cash Equivalents [Member] | Corporate Bonds [Member] | Fair Value                                                                             |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 116           | 380           |
| Short-Term Investments And Cash Equivalents [Member] | U.S. Treasury Securities [Member] | Fair Value                                                                    |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 104           | 437           |
| Short-Term Investments And Cash Equivalents [Member] | US Agencies Securities [Member] | Fair Value                                                                      |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             |          | 3             |
| Short-Term Investments And Cash Equivalents [Member] | Commercial Paper [Member] | Fair Value                                                                            |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 51            | 142           |
| Short-Term Investments And Cash Equivalents [Member] | Debt Security, Government, Non-US [Member] | Fair Value                                                           |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             |          | 67            |
| Short-Term Investments And Cash Equivalents [Member] | Certificates of Deposit [Member] | Fair Value                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             |          | 41            |
| Short-Term Investments And Cash Equivalents [Member] | Asset-backed Securities [Member] | Fair Value                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value                                                                      |          | 112           |
| Short-Term Investments And Cash Equivalents [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. Treasury Securities [Member] |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 104           | 437           |
| Short-Term Investments And Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]                                 |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 116           | 380           |
| Short-Term Investments And Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]                                |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Available-for-sale of securities                                                                                                                             | 51            | 142           |
| Cash Equivalents [Member] | Bank Time Deposits [Member] | Fair Value                                                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Cash equivalents                                                                                                                                             | 55            | 157           |
| Cash Equivalents [Member] | Money Market Funds [Member] | Fair Value                                                                                                     |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Cash equivalents                                                                                                                                             | 257           | 2,100         |
| Cash Equivalents [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Bank Time Deposits [Member]                                  |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Cash equivalents                                                                                                                                             | 55            | 157           |
| Cash Equivalents [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Money Market Funds [Member]                                  |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Cash equivalents                                                                                                                                             | 257           | 2,100         |
| Other Current Assets and Other Assets [Domain] | Foreign Currency Derivatives [Member] | Fair Value                                                                      |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Foreign currency derivatives, assets                                                                                                                         | 63            | 33            |
| Other Current Assets and Other Assets [Domain] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Derivatives [Member]                          |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Foreign currency derivatives, assets                                                                                                                         | 63            | 33            |
| Other Assets [Member] | Deferred compensation plan assets | Fair Value                                                                                                   |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Deferred compensation plan assets and liabilities                                                                                                            | 21            | 18            |
| Other Assets [Member] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan assets                                |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Deferred compensation plan assets and liabilities                                                                                                            | 21            | 18            |
| Accrued and Other Current Liabilities [Member] | Foreign Currency Derivatives [Member] | Fair Value                                                                      |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Foreign currency derivatives, liabilities                                                                                                                    | 14            | 40            |
| Accrued and Other Current Liabilities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Derivatives [Member]                          |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Foreign currency derivatives, liabilities                                                                                                                    | 14            | 40            |
| Other Liabilities [Members] | Deferred Compensation Plan Liabilities [Member] | Fair Value                                                                               |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Deferred compensation plan assets and liabilities                                                                                                            | 22            | 19            |
| Other Liabilities [Members] | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred Compensation Plan Liabilities [Member]            |          |          |
| **Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                        |          |          |
| Fair value, Deferred compensation plan assets and liabilities                                                                                                            | $ 22          | $ 19          |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| - Definition
Fair 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.
+ References
No definition available.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The 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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| - Definition
Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.
+ References
No definition available.
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| - Definition
Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.
+ References
No definition available.
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| - Definition
Fair value of financial and nonfinancial obligations.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).
+ References
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