XML 62 R4.htm IDEA: XBRL DOCUMENT

Consolidated Statement of Comprehensive Income (Parentheticals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Statement Of Income And Comprehensive Income [Abstract]
Unrealized gain (loss) on available-for-sale marketable securities, tax provision (benefit)	$ 9	$ 3
Reclassification adjustment for net gain (loss) on available-for-sale marketable securities included in net income, tax provision (benefit)	$ 1	$ (1)

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.