| **Financial Instruments (Fair Value Of Marketable Equity Securities Schedule) (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2012 | Mar. 31, 2012 |
|------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial Instruments**                                                                                                                |          |          |  |
| Fair value                                                                                                                               | $ 59          | $ 119         | [1] |
| Marketable Equity Securities                                                                                                             |          |          |  |
| **Financial Instruments**                                                                                                                |          |          |  |
| Adjusted Cost                                                                                                                            | 21            | 32            |  |
| Gross Unrealized Gains                                                                                                                   | 38            | 87            |  |
| Gross Unrealized Losses                                                                                                                  | 0             | 0             |  |
| Fair value                                                                                                                               | $ 59          | $ 119         |  |
|                                                                                                                                          |
| [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
Equity securities categorized neither as held-to-maturity nor trading which are intended be sold within one year from the balance sheet date or the normal operating cycle, whichever is 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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| - 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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