| **Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($) $ in Millions** | Sep. 30, 2016 | Mar. 31, 2016 |
|-------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial Instruments**                                                                                                           |          |          |  |
| Short-term investments, Fair Value                                                                                                  | $ 1,520       | $ 1,341       | [1] |
| Due in 1 year or less [Member]                                                                                                      |          |          |  |
| **Financial Instruments**                                                                                                           |          |          |  |
| Due in 1 year or less, Amortized Cost                                                                                               | 749           | 571           |  |
| Due in 1 year or less, Fair Value                                                                                                   | 749           | 571           |  |
| Due in 1-2 years [Member]                                                                                                           |          |          |  |
| **Financial Instruments**                                                                                                           |          |          |  |
| Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis                                         | 415           | 461           |  |
| Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value                                                   | 416           | 462           |  |
| Due in 2-3 years [Member]                                                                                                           |          |          |  |
| **Financial Instruments**                                                                                                           |          |          |  |
| Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis                                         | 295           | 295           |  |
| Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value                                                   | 296           | 296           |  |
| Due in 3-4 years [Member]                                                                                                           |          |          |  |
| **Financial Instruments**                                                                                                           |          |          |  |
| Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis                                         | 59            | 12            |  |
| Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value                                                   | $ 59          | $ 12          |  |
|                                                                                                                                     |
| [1]Derived from audited Consolidated Financial Statements.                                                                          |

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| - Definition
Financial Instruments [Line Items]
+ References
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| - Definition
Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
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