Consolidated Statements Of Stockholders' Equity (USD $) In Millions	Common Stock [Member]	Additional Paid-In Capital [Member]	Other Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Beginning Balance at Mar. 31, 2009	$ 4	$ 4,417	$ (8)	$ 6,103	$ (179)	$ (4,144)	$ 6,193
Beginning Balance, Shares at Mar. 31, 2009	351					(80)
Issuance of shares under employee plans		218				(24)	194
Issuance of shares under employee plans, shares	8					(1)
Share-based compensation		114					114
Tax benefit related to issuance of shares under employee plans		11					11
Translation adjustments					238		238
Unrealized net loss and other components of benefit plans, net of tax benefit					(53)		(53)
Net income				1,263			1,263
Repurchase of common stock						(299)	(299)
Repurchase of common stock, Shares						(7)
Cash dividends declared, $0.80 for 2012, $0.72 for 2011 and $0.48 for 2010 per common share				(131)			(131)
Other		(4)	(4)	1		9	2
Ending Balance at Mar. 31, 2010	4	4,756	(12)	7,236	6	(4,458)	7,532
Comprehensive income at Mar. 31, 2010							1,448
Ending Balance, Shares at Mar. 31, 2010	359					(88)
Issuance of shares under employee plans		370				(17)	353
Issuance of shares under employee plans, shares	10
Share-based compensation		137					137
Tax benefit related to issuance of shares under employee plans		113					113
Translation adjustments					76		76
Net income				1,202			1,202
Repurchase of common stock		(37)				(1,995)	(2,032)
Repurchase of common stock, Shares						(29)
Cash dividends declared, $0.80 for 2012, $0.72 for 2011 and $0.48 for 2010 per common share				(188)			(188)
Other			22		5		27
Ending Balance at Mar. 31, 2011	4	5,339	10	8,250	87	(6,470)	7,220
Comprehensive income at Mar. 31, 2011							1,283
Ending Balance, Shares at Mar. 31, 2011	369					(117)
Issuance of shares under employee plans		167				(24)	143
Issuance of shares under employee plans, shares	4					(1)
Share-based compensation		154					154
Tax benefit related to issuance of shares under employee plans		46					46
Translation adjustments					(56)		(56)
Unrealized net loss and other components of benefit plans, net of tax benefit					(21)		(21)
Net income				1,403			1,403
Repurchase of common stock		(140)				(1,710)	(1,850)
Repurchase of common stock, Shares						(20)
Cash dividends declared, $0.80 for 2012, $0.72 for 2011 and $0.48 for 2010 per common share				(202)			(202)
Other		5	(6)		(5)		(6)
Ending Balance at Mar. 31, 2012	4	5,571	4	9,451	5	(8,204)	6,831
Comprehensive income at Mar. 31, 2012							$ 1,321
Ending Balance, Shares at Mar. 31, 2012	373					(138)