Consolidated Statements of Stockholders' Equity (USD $) In Millions		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Other Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Mar. 31, 2010		$ 7,532	$ 4	$ 4,756	$ (12)	$ 7,236	$ 6	$ (4,458)
Beginning Balance, Shares at Mar. 31, 2010			359
Beginning Balance, Treasury Stock, Shares at Mar. 31, 2010								(88)
Issuance of shares under employee plans		353		370
Adjustments Related to Tax Withholding for Share-based Compensation								(17)
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
Other Comprehensive Income (Loss), net of tax		81					81
Net income		1,202				1,202
Repurchase of common stock		(2,032)		(37)				(1,995)
Repurchase of common stock, Shares		(29.0)						(29.0)
Cash dividends declared: $0.80 for 2013, $0.80 for 2012 and $0.72 for 2011 per common share		(188)				(188)
Other		22			22
Ending Balance at Mar. 31, 2011		7,220	4	5,339	10	8,250	87	(6,470)
Ending Balance, Shares at Mar. 31, 2011			369
Ending Balance, Treasury Stock, Shares at Mar. 31, 2011								(117)
Issuance of shares under employee plans		143		167
Shares Paid for Tax Withholding for Share Based Compensation								(1)
Adjustments Related to Tax Withholding for Share-based Compensation								(24)
Issuance of shares under employee plans, shares			4
Share-based compensation		154		154
Tax benefit related to issuance of shares under employee plans		46		46
Other Comprehensive Income (Loss), net of tax		(82)					(82)
Net income		1,403				1,403
Repurchase of common stock		(1,850)		(140)				(1,710)
Repurchase of common stock, Shares		(20.0)						(20.0)
Cash dividends declared: $0.80 for 2013, $0.80 for 2012 and $0.72 for 2011 per common share		(202)				(202)
Other		(1)		5	(6)
Ending Balance at Mar. 31, 2012		6,831	4	5,571	4	9,451	5	(8,204)
Ending Balance, Shares at Mar. 31, 2012			373
Ending Balance, Treasury Stock, Shares at Mar. 31, 2012		(138)						(138)
Issuance of shares under employee plans		111		166
Adjustments Related to Tax Withholding for Share-based Compensation								(55)
Issuance of shares under employee plans, shares			5
Share-based compensation		167		167
Tax benefit related to issuance of shares under employee plans		34		34
Other Comprehensive Income (Loss), net of tax		(70)					(70)
Net income		1,338				1,338
Repurchase of common stock		(1,159)		162				(1,321)
Repurchase of common stock, Shares		(13.0)						(13.0)
Retirement of treasury stock		0		(22)		(195)		217
Retirement of treasury stock, Shares			(2)
Retirement of treasury stock, Shares								2.0
Cash dividends declared: $0.80 for 2013, $0.80 for 2012 and $0.72 for 2011 per common share		(192)				(192)
Other		10			10
Ending Balance at Mar. 31, 2013		7,070	4	6,078	14	10,402	(65)	(9,363)
Ending Balance, Shares at Mar. 31, 2013			376
Ending Balance, Treasury Stock, Shares at Mar. 31, 2013		(149)						(149)
Beginning Balance at Dec. 31, 2012
Net income	[1],[2],[3]	259
Retirement of treasury stock		(217)				(195)
Retirement of treasury stock, Shares		1.8
Ending Balance at Mar. 31, 2013		$ 7,070				$ 10,402
Ending Balance, Treasury Stock, Shares at Mar. 31, 2013		(149)

[1] Financial results for the first, second and fourth quarters of 2013 include AWP litigation charges of $16 million pre-tax ($10 million after-tax), $44 million pre-tax ($27 million after-tax) and $12 million pre-tax ($8 million after-tax), which were recorded in operating expenses.

[2] Financial results for the second, third and fourth quarters of 2013 include the pre-tax receipts of $19 million, $8 million and $17 million representing our share of settlements of antitrust class action lawsuits brought against drug manufacturers, which were recorded as a reduction to cost of sales.

[3] Financial results for the fourth quarter of 2013 include the following pre-tax impairment charges: an equity investment of $191 million, goodwill of $36 million, and capitalized software held for sale of $10 million.