| **Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions** | Mar. 31, 2018 | Mar. 31, 2017 |
|------------------------------------------------------------------------------------------|---------------|---------------|
| **Income Tax Disclosure [Abstract]**                                                     |          |          |
| Accruals, reserves and other expenses                                                    | $ 81          | $ 151         |
| Tax credit carryforwards                                                                 | 121           | 276           |
| Stock-based compensation                                                                 | 24            | 37            |
| Net operating loss & capital loss carryforwards                                      | 23            | 25            |
| Total                                                                                    | 249           | 489           |
| Valuation allowance                                                                      | (138)         | (114)         |
| Deferred tax assets, net of valuation allowance                                          | 111           | 375           |
| Amortization and Depreciation                                                            | (27)          | (19)          |
| Unremitted earnings of foreign subsidiaries                                              | 0             | 70            |
| Prepaids and other liabilities                                                           | (2)           | (1)           |
| Total                                                                                    | (29)          | (90)          |
| Deferred tax assets, net of valuation allowance and deferred tax liabilities             | $ 82          | $ 285         |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Deferred Tax Assets Net Operating Loss And Capital Loss Carry forwards
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| - Definition
Deferred Tax Liability State Effect On Unremitted Earnings of Foreign Subsidiaries
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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 and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.
+ References
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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
Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.
+ 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.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.
+ References
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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, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.
+ References
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences classified as other.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
+ References
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