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Consolidated Statement of Comprehensive Income (Parentheticals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net unrealized (losses) gains on available-for-sale marketable securities, tax benefit (provision)	$ 31	$ (9)
Reclassification adjustment for net (losses) gains on available-for-sale marketable securities included in investment and other income, net of tax (benefit) provision	$ (10)	$ 1

- 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