Earnings Per Common Share (Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income from continuing operations																	$ 1,403		$ 1,130		$ 1,263
Discontinued operation - gain on sale, net of tax																	0		72		0
Net Income	$ 521	[1],[2]	$ 300	[1],[2]	$ 296	[1],[2]	$ 286	[1],[2]	$ 422	[1],[3],[4],[5]	$ 155	[1],[3],[4],[5]	$ 327	[1],[3],[4],[5]	$ 298	[1],[3],[4],[5]	$ 1,403		$ 1,202		$ 1,263
Weighted average common shares outstanding:
Basic																	246		258		269
Effect of dilutive securities:
Diluted																	251		263		273
Basic
Continuing operations									$ 1.65	[1],[3],[4],[5],[6]	$ 0.61	[1],[3],[4],[5],[6]	$ 0.99	[1],[3],[4],[5],[6]	$ 1.12	[1],[3],[4],[5],[6]	$ 5.70	[6]	$ 4.37	[6]	$ 4.70	[6]
Discontinued operation, net									$ 0.00	[5]	$ 0.00	[5]	$ 0.28	[5]	$ 0.00	[5]	$ 0.00	[6]	$ 0.28	[6]	$ 0.00	[6]
Total	$ 2.14	[1],[2],[6]	$ 1.22	[1],[2],[6]	$ 1.20	[1],[2],[6]	$ 1.15	[1],[2],[6]	$ 1.65	[1],[3],[4],[5],[6]	$ 0.61	[1],[3],[4],[5],[6]	$ 1.27	[1],[3],[4],[5],[6]	$ 1.12	[1],[3],[4],[5],[6]	$ 5.70	[6]	$ 4.65	[6]	$ 4.70	[6]
Diluted
Continuing operations									$ 1.62	[1],[3],[4],[5],[6]	$ 0.60	[1],[3],[4],[5],[6]	$ 0.97	[1],[3],[4],[5],[6]	$ 1.10	[1],[3],[4],[5],[6]	$ 5.59	[6]	$ 4.29	[6]	$ 4.62	[6]
Discontinued Operations, net									$ 0.00	[5]	$ 0.00	[5]	$ 0.28	[5]	$ 0.00	[5]	$ 0.00	[6]	$ 0.28	[6]	$ 0.00	[6]
Total	$ 2.09	[1],[2],[6]	$ 1.20	[1],[2],[6]	$ 1.18	[1],[2],[6]	$ 1.13	[1],[2],[6]	$ 1.62	[1],[3],[4],[5],[6]	$ 0.60	[1],[3],[4],[5],[6]	$ 1.25	[1],[3],[4],[5],[6]	$ 1.10	[1],[3],[4],[5],[6]	$ 5.59	[6]	$ 4.57	[6]	$ 4.62	[6]
Earnings Per Common Share
Potentially dilutive securities excluded from diluted earnings per share																	4		6		8
Options To Purchase Common Stock [Member]
Effect of dilutive securities:
Dilutive securities																	2		3		3
RSUs [Member]
Effect of dilutive securities:
Dilutive securities																	3		2		1

[1] Financial results for the second, third and fourth quarters of 2012 include AWP litigation charges of $118 million pre-tax ($77 million after-tax), $27 million pre-tax ($15 million after-tax) and $4 million pre-tax (benefit of $32 million after-tax), which were recorded in operating expenses. Financial results for the second and third quarters of 2011 include AWP litigation charges of $24 million pre-tax ($16 million after-tax) and $189 million pre-tax ($133 million after-tax), which were recorded in operating expenses.

[2] Financial results for the third and fourth quarters of 2012 include product alignment charges of $42 million and $9 million.

[3] Financial results for the first quarter of 2011 include the receipt of $51 million representing our share of a settlement of an antitrust class action lawsuit brought against a drug manufacturer, which was recorded as a reduction to cost of sales.

[4] Financial results for the second quarter of 2011 include a $72 million asset impairment charge for capitalized software held for sale, which was recorded to cost of sales.

[5] Financial results for the second quarter of 2011 include a $95 million pre-tax ($72 million after-tax) gain from the sale of MAP.

[6] Certain computations may reflect rounding adjustments.