Consolidated Statements of Stockholders' Equity (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock
Beginning balance at Mar. 31, 2010	$ 4,987	$ 59	$ 3,657	$ 3,361	$ (126)	$ (1,964)
Net income	827			827
Other comprehensive income (loss)	61				61
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
Other comprehensive income (loss)	(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)
Net income	955			955
Other comprehensive income (loss)	(47)				(47)
Comprehensive income	908
Share-based compensation	78		78
Dividends declared	(463)			(463)
Release of restricted stock, exercise of common stock options, ESPP and other items	25		(101)			126
Accelerated share repurchase	0		125			(125)
Treasury stock purchased	(495)					(495)
Ending balance at Mar. 31, 2013	$ 5,450	$ 59	$ 3,593	$ 5,357	$ (155)	$ (3,404)