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Consolidated Statement of Shareholder's Equity (Parentheticals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Statement of Stockholders' Equity [Abstract]
Unrealized gain (loss) on available-for-sale marketable securities, tax provision (benefit)	$ 23	$ 3	$ 95
Reclassification adjustment for net gain (loss) on available-for-sale marketable securities included in net income, tax provision (benefit)	$ (10)	$ 5	$ (8)

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.