Consolidated Statements of Stockholders' Equity and Comprehensive Loss (USD $) In Millions, except Share data in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Mar. 31, 2008	$ 4,339	$ 3	$ 1,864	$ 1,888	$ 584
Beginning Balance (in shares) at Mar. 31, 2008		317,681
Net loss	(1,088)	0		(1,088)
Change in unrealized gains (losses) on available-for-sale securities, net	(366)	0			(366)
Reclassification adjustment for losses (gains) realized on available-for-sale securities, net	55	0			55
Change in unrealized gains (losses) on derivative instruments, net	14	0			14
Reclassification adjustment for losses (gains) realized on derivative instruments, net	(10)	0			(10)
Foreign currency translation adjustments	(88)	0			(88)
Total comprehensive loss	(1,483)	0
Issuance of common stock (shares)		5,161
Issuance of common stock	73	0	73
Repurchase and retirement of common stock	0
Stock-based compensation	203	0	203
Tax benefit from exercise of stock options	2	0	2
Equity consideration granted in connection with acquisition	0
Ending Balance at Mar. 31, 2009	3,134	3	2,142	800	189
Ending Balance (in shares) at Mar. 31, 2009		322,842
Net loss	(677)	0		(677)
Change in unrealized gains (losses) on available-for-sale securities, net	(54)	0			(54)
Reclassification adjustment for losses (gains) realized on available-for-sale securities, net	21	0			21
Change in unrealized gains (losses) on derivative instruments, net	(2)	0			(2)
Reclassification adjustment for losses (gains) realized on derivative instruments, net	1	0			1
Foreign currency translation adjustments	73	0			73
Total comprehensive loss	(638)	0
Issuance of common stock (shares)		6,745
Issuance of common stock	21	0	21
Repurchase and retirement of common stock	0
Stock-based compensation	187	0	187
Tax benefit from exercise of stock options	14	0	14
Equity consideration granted in connection with acquisition	11	0	11
Ending Balance at Mar. 31, 2010	2,729	3	2,375	123	228
Ending Balance (in shares) at Mar. 31, 2010	330,000	329,587
Net loss	(276)	0		(276)	0
Change in unrealized gains (losses) on available-for-sale securities, net	(4)	0			(4)
Reclassification adjustment for losses (gains) realized on available-for-sale securities, net	(28)	0			(28)
Change in unrealized gains (losses) on derivative instruments, net	(7)	0			(7)
Reclassification adjustment for losses (gains) realized on derivative instruments, net	5	0			5
Foreign currency translation adjustments	25	0			25
Total comprehensive loss	(285)	0
Issuance of common stock (shares)		6,081
Issuance of common stock	4	0	4
Repurchase and retirement of common stock (in shares)		(3,104)
Repurchase and retirement of common stock	(58)	0	(58)
Stock-based compensation	176	0	176
Tax costs from exercise of stock options	(2)	0	(2)
Equity consideration granted in connection with acquisition	0
Ending Balance at Mar. 31, 2011	$ 2,564	$ 3	$ 2,495	$ (153)	$ 219
Ending Balance (in shares) at Mar. 31, 2011	333,000	332,564

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Tax costs from exercise of stock options

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This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized).

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Tax benefit associated with any share-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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-Name Emerging Issues Task Force (EITF)
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-Number 141R
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Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Excludes common shares repurchased by the entity and held as Treasury shares. Shares outstanding equals shares issued minus shares held in treasury. Does not include common shares that have been repurchased.

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-Name Accounting Principles Board Opinion (APB)
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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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-Name Accounting Research Bulletin (ARB)
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-Paragraph A5
-Appendix A

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-Paragraph 8, 9, 10, 11, 12, 13, 14

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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-Number 95
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Change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Net of tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

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Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain or loss, net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain or loss at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains or losses realized upon the sale of securities, after tax; and (3) the unrealized gains or losses realized upon the write-down of securities, after tax.

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Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Number of new stock issued during the period.

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Value of new stock issued during the period.

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Number of shares that have been repurchased and retired during the period.

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Value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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