Consolidated Statements of Stockholders' Equity (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Beginning Balance at Mar. 31, 2009	$ 4,362	$ 59	$ 3,686	$ 2,673	$ (183)	$ (1,873)
Net income	771			771
Translation adjustment	55				55
Unrealized gain on derivatives, net of $1 million in taxes	2				2
Comprehensive income	828
Share-based compensation	102		102
Dividends declared	(83)			(83)
Release of restricted stock, exercise of common stock options, ESPP and other items	5		(131)			136
Treasury stock purchased	(227)					(227)
Ending Balance at Mar. 31, 2010	4,987	59	3,657	3,361	(126)	(1,964)
Net income	827			827
Translation adjustment	58				58
Realized loss on derivatives, net of $2 million in taxes	3				3
Comprehensive income	888
Share-based compensation	80		80
Dividends declared	(82)			(82)
Release of restricted stock, exercise of common stock options, ESPP and other items	(15)		(122)			107
Treasury stock purchased	(238)					(238)
Ending Balance at Mar. 31, 2011	5,620	59	3,615	4,106	(65)	(2,095)
Net income	951			951
Translation adjustment	(43)				(43)
Comprehensive income	908
Share-based compensation	89		89
Dividends declared	(192)			(192)
Release of restricted stock, exercise of common stock options, ESPP and other items	22		(88)			110
Accelerated share repurchase	(500)		(125)			(375)
Treasury stock purchased	(550)					(550)
Ending Balance at Mar. 31, 2012	$ 5,397	$ 59	$ 3,491	$ 4,865	$ (108)	$ (2,910)