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Consolidated Statement of Comprehensive Income (Parentheticals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Unrealized gains on available-for-sale marketable securities, tax provision (benefit)	$ 40	$ 23	$ 3
Reclassification adjustment for net (gains) losses on available-for-sale marketable securities included in net income, tax provision (benefit)	$ 8	$ (10)	$ 5

- Definition

Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

+ References+ Details

- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References+ Details