The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes 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. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Significant Accounting Policies 1 (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Sep. 30, 2010	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Accounting Policies [Abstract]
Gain on sale of equity investment	$ 10
Foreign currency transaction losses		(12)	(4)	(18)
Percentage of cash and cash equivalents held by the Company's foreign subsidiaries outside the United States		62.00%	64.00%
Interest income		20	30	24
Minimum restricted cash balance		50
Total amount of restricted cash		$ 52	$ 56
Capitalized Software Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Estimated useful life		5 years
Purchased Software Products [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Estimated useful life		3 years
Purchased Software Products [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Estimated useful life		10 years
Other Intangible Assets [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Estimated useful life		2 years
Other Intangible Assets [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Estimated useful life		12 years