| **Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $)In Millions, unless otherwise specified** | Mar. 31, 2014 | Mar. 31, 2013 |
|-----------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Income Tax Disclosure [Abstract]**                                                                            |          |          |
| Accruals, reserves and other expenses                                                                           | $ 163         | $ 179         |
| Tax credit carryforwards                                                                                        | 462           | 214           |
| Stock-based compensation                                                                                        | 43            | 46            |
| Net operating loss & capital loss carryforwards                                                             | 199           | 286           |
| Total                                                                                                           | 867           | 725           |
| Valuation allowance                                                                                             | (675)         | (510)         |
| Deferred tax assets, net of valuation allowance                                                                 | 192           | 215           |
| Depreciation                                                                                                    | (12)          | (16)          |
| State effect on federal taxes                                                                                   | (63)          | (56)          |
| Amortization                                                                                                    | (28)          | (34)          |
| Prepaids and other liabilities                                                                                  | (9)           | (11)          |
| Total                                                                                                           | (112)         | (117)         |
| Deferred tax assets, net of valuation allowance and deferred tax liabilities                                    | $ 80          | $ 98          |

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Deferred Tax Assets Net Operating Loss And Capital Loss Carry forwards
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Deferred Tax Liability State Effect On Federal Taxes
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
+ References
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| - Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.
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| - Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.
+ References
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.
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| - Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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