Segment Information (Schedule Of Segment Information) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Revenues
Segment Reporting Revenue From External Customers	$ 30,216		$ 27,534		$ 60,196		$ 54,984
Operating profit
Interest Expense	(64)		(44)		(128)		(87)
Income from Continuing Operations Before Income Taxes	420		376		836		816
Technology Solutions [Member]
Revenues
Segment Reporting Revenue From External Customers	825		770		1,627		1,529
Operating profit
Operating profit	108	[1]	14	[1]	208	[1]	78	[1]
Technology Solutions - Services [Member]
Revenues
Segment Reporting Revenue From External Customers	643		604		1,273		1,199
Technology Solutions - Software And Software Systems [Member]
Revenues
Segment Reporting Revenue From External Customers	153		138		297		273
Technology Solutions - Hardware [Member]
Revenues
Segment Reporting Revenue From External Customers	29		28		57		57
Distribution Solutions [Member]
Revenues
Segment Reporting Revenue From External Customers	29,391	[2]	26,764	[2]	58,569	[2]	53,455	[2]
Operating profit
Operating profit	477	[3]	491	[3]	952	[3]	996	[3]
Distribution Solutions - Direct Distribution And Services [Member]
Revenues
Segment Reporting Revenue From External Customers	21,072	[2]	18,984	[2]	41,899	[2]	37,686	[2]
Distribution Solutions - Sales To Customers' Warehouses [Member]
Revenues
Segment Reporting Revenue From External Customers	4,909	[2]	4,659	[2]	9,800	[2]	9,402	[2]
Distribution Solutions - Domestic Pharmaceutical Distribution And Services [Member]
Revenues
Segment Reporting Revenue From External Customers	25,981	[2]	23,643	[2]	51,699	[2]	47,088	[2]
Distribution Solutions - Canada Pharmaceutical Distribution And Services [Member]
Revenues
Segment Reporting Revenue From External Customers	2,537	[2]	2,351	[2]	5,266	[2]	4,911	[2]
Distribution Solutions - Medical Surgical Distribution And Services [Member]
Revenues
Segment Reporting Revenue From External Customers	873	[2]	770	[2]	1,604	[2]	1,456	[2]
Corporate [Member]
Operating profit
Operating profit	(101)		(85)		(196)		(171)
Reportable Segment [Member]
Operating profit
Operating profit	$ 585		$ 505		$ 1,160		$ 1,074

[1] Operating profit for the quarter and six months ended September 30, 2010 includes a $72 million asset impairment charge for capitalized software held for sale, which was recorded in cost of sales.

[2] Revenues derived from services represent less than 2% of this segment's total revenues for the quarters and six months ended September 30, 2011 and 2010.

[3] Operating profit includes AWP litigation charges of $118 million for the quarter and six months ended September 30, 2011 and $24 million for the quarter and six months ended September 30, 2010, which were recorded in operating expenses. Operating profit for the six months ended September 30, 2010 includes 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.