| **Financial Instruments (Fair Value Of Short-Term Investments) (Details) (USD $)In Millions, unless otherwise specified** | Jun. 30, 2013 | Mar. 31, 2013 |
|---------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial Instruments**                                                                                                 |          |          |  |
| Fair Value                                                                                                                | $ 355         | $ 388         | [1] |
| Short-Term Investments                                                                                                    |          |          |  |
| **Financial Instruments**                                                                                                 |          |          |  |
| Cost or Amortized Cost                                                                                                    | 356           | 387           |  |
| Gross Unrealized Gains                                                                                                    | 0             | 1             |  |
| Gross Unrealized Losses                                                                                                   | 1             | 0             |  |
| Fair Value                                                                                                                | 355           | 388           |  |
| Short-Term Investments | Corporate bonds                                                                                  |          |          |  |
| **Financial Instruments**                                                                                                 |          |          |  |
| Cost or Amortized Cost                                                                                                    | 194           | 177           |  |
| Gross Unrealized Gains                                                                                                    | 0             | 1             |  |
| Gross Unrealized Losses                                                                                                   | 1             | 0             |  |
| Fair Value                                                                                                                | 193           | 178           |  |
| Short-Term Investments | U.S. agency securities                                                                           |          |          |  |
| **Financial Instruments**                                                                                                 |          |          |  |
| Cost or Amortized Cost                                                                                                    | 69            | 76            |  |
| Gross Unrealized Gains                                                                                                    | 0             | 0             |  |
| Gross Unrealized Losses                                                                                                   | 0             | 0             |  |
| Fair Value                                                                                                                | 69            | 76            |  |
| Short-Term Investments | U.S. Treasury securities                                                                         |          |          |  |
| **Financial Instruments**                                                                                                 |          |          |  |
| Cost or Amortized Cost                                                                                                    | 53            | 85            |  |
| Gross Unrealized Gains                                                                                                    | 0             | 0             |  |
| Gross Unrealized Losses                                                                                                   | 0             | 0             |  |
| Fair Value                                                                                                                | 53            | 85            |  |
| Short-Term Investments | Commercial Paper                                                                                 |          |          |  |
| **Financial Instruments**                                                                                                 |          |          |  |
| Cost or Amortized Cost                                                                                                    | 40            | 49            |  |
| Gross Unrealized Gains                                                                                                    | 0             | 0             |  |
| Gross Unrealized Losses                                                                                                   | 0             | 0             |  |
| Fair Value                                                                                                                | $ 40          | $ 49          |  |
|                                                                                                                           |
| [1]Derived from audited consolidated financial statements.                                                                |

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| - Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.
+ 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
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
No definition available.
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