Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Consolidated Statements Of Operations [Abstract]
Revenues	$ 122,734		$ 112,084		$ 108,702
Cost of Sales	116,167		106,114		103,026
Gross Profit	6,567		5,970		5,676
Operating Expenses
Selling	764		767		746
Distribution	997		920		882
Research and development	440		407		376
Administrative	2,068		1,842		1,684
Litigation charges (credit), net	149		213		(20)
Total Operating Expenses	4,418		4,149		3,668
Operating Income	2,149		1,821		2,008
Other Income, Net	21		36		43
Interest Expense	(251)		(222)		(187)
Income from Continuing Operations Before Income Taxes	1,919		1,635		1,864
Income Tax Expense	(516)		(505)		(601)
Income from Continuing Operations	1,403		1,130		1,263
Discontinued Operation - gain on sale, net of tax	0		72		0
Net Income	$ 1,403		$ 1,202		$ 1,263
Diluted
Continuing operations	$ 5.59	[1]	$ 4.29	[1]	$ 4.62	[1]
Discontinued operation - gain on sale	$ 0.00	[1]	$ 0.28	[1]	$ 0.00	[1]
Total	$ 5.59	[1]	$ 4.57	[1]	$ 4.62	[1]
Basic
Continuing operations	$ 5.70	[1]	$ 4.37	[1]	$ 4.70	[1]
Discontinued operation - gain on sale	$ 0.00	[1]	$ 0.28	[1]	$ 0.00	[1]
Total	$ 5.70	[1]	$ 4.65	[1]	$ 4.70	[1]
Weighted Average Common Shares
Diluted	251		263		273
Basic	246		258		269

[1] Certain computations may reflect rounding adjustments.