Segment Information (Schedule of Segment Information) (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Reportable Segment [Member]	Dec. 31, 2012 Reportable Segment [Member]	Dec. 31, 2013 Reportable Segment [Member]	Dec. 31, 2012 Reportable Segment [Member]	Dec. 31, 2013 Distribution Solutions [Member]		Dec. 31, 2012 Distribution Solutions [Member]		Dec. 31, 2013 Distribution Solutions [Member]		Dec. 31, 2012 Distribution Solutions [Member]		Dec. 31, 2013 Distribution Solutions Domestic Pharmaceutical Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Domestic Pharmaceutical Distribution And Services [Member]	Dec. 31, 2013 Distribution Solutions Domestic Pharmaceutical Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Domestic Pharmaceutical Distribution And Services [Member]	Dec. 31, 2013 Distribution Solutions Direct Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Direct Distribution And Services [Member]	Dec. 31, 2013 Distribution Solutions Direct Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Direct Distribution And Services [Member]	Dec. 31, 2013 Distribution Solutions Sales To Customers Warehouses [Member]	Dec. 31, 2012 Distribution Solutions Sales To Customers Warehouses [Member]	Dec. 31, 2013 Distribution Solutions Sales To Customers Warehouses [Member]	Dec. 31, 2012 Distribution Solutions Sales To Customers Warehouses [Member]	Dec. 31, 2013 Distribution Solutions Canada Pharmaceutical Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Canada Pharmaceutical Distribution And Services [Member]	Dec. 31, 2013 Distribution Solutions Canada Pharmaceutical Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Canada Pharmaceutical Distribution And Services [Member]	Dec. 31, 2013 Distribution Solutions Medical Surgical Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Medical Surgical Distribution And Services [Member]	Dec. 31, 2013 Distribution Solutions Medical Surgical Distribution And Services [Member]	Dec. 31, 2012 Distribution Solutions Medical Surgical Distribution And Services [Member]	Dec. 31, 2013 Technology Solutions [Member]		Dec. 31, 2012 Technology Solutions [Member]		Dec. 31, 2013 Technology Solutions [Member]		Dec. 31, 2012 Technology Solutions [Member]		Dec. 31, 2013 Technology Solutions Services [Member]	Dec. 31, 2012 Technology Solutions Services [Member]	Dec. 31, 2013 Technology Solutions Services [Member]	Dec. 31, 2012 Technology Solutions Services [Member]	Dec. 31, 2013 Technology Solutions Software [Member]	Dec. 31, 2012 Technology Solutions Software [Member]	Dec. 31, 2013 Technology Solutions Software [Member]	Dec. 31, 2012 Technology Solutions Software [Member]	Dec. 31, 2013 Technology Solutions Hardware [Member]	Dec. 31, 2012 Technology Solutions Hardware [Member]	Dec. 31, 2013 Technology Solutions Hardware [Member]	Dec. 31, 2012 Technology Solutions Hardware [Member]	Dec. 31, 2013 Corporate Segment [Member]		Dec. 31, 2012 Corporate Segment [Member]		Dec. 31, 2013 Corporate Segment [Member]		Dec. 31, 2012 Corporate Segment [Member]		Dec. 31, 2013 Cost of sales [Member] Technology Solutions [Member]	Dec. 31, 2013 Cost of sales [Member] Technology Solutions [Member]	Dec. 31, 2013 Operating expense [Member] Technology Solutions [Member]	Dec. 31, 2013 Operating expense [Member] Technology Solutions [Member]	Dec. 31, 2012 RAMQ [Member] Operating expense [Member] Distribution Solutions [Member]	Dec. 31, 2012 RAMQ [Member] Operating expense [Member] Distribution Solutions [Member]	Jun. 30, 2013 Corporate Headquarters [Member]	Apr. 06, 2012 Corporate Headquarters [Member]	Dec. 31, 2013 Antitrust Class Action Lawsuit [Member] Cost of sales [Member] Distribution Solutions [Member]	Dec. 31, 2012 Antitrust Class Action Lawsuit [Member] Cost of sales [Member] Distribution Solutions [Member]	Dec. 31, 2013 Antitrust Class Action Lawsuit [Member] Cost of sales [Member] Distribution Solutions [Member]	Dec. 31, 2012 Antitrust Class Action Lawsuit [Member] Cost of sales [Member] Distribution Solutions [Member]	Dec. 31, 2013 Maximum [Member] Distribution Solutions [Member]	Dec. 31, 2012 Maximum [Member] Distribution Solutions [Member]	Dec. 31, 2013 Maximum [Member] Distribution Solutions [Member]	Dec. 31, 2012 Maximum [Member] Distribution Solutions [Member]
Segment Reporting Information [Line Items]
Litigation Settlement, Amount																																																																									$ 27,000,000	$ 8,000,000	$ 34,000,000	$ 27,000,000
Litigation charges	18,000,000	0	68,000,000	60,000,000																																																																	40,000,000	40,000,000
Other nonrecurring expense																																					57,000,000				60,000,000																								34,000,000	34,000,000	23,000,000	26,000,000
Expenses related to acquisition																																																									25,000,000				25,000,000
Segment Reporting Revenue From External Customers	34,306,000,000	31,099,000,000	99,468,000,000	91,553,000,000					33,522,000,000	[1]	30,361,000,000	[1]	97,094,000,000	[1]	89,347,000,000	[1]	29,275,000,000	26,854,000,000	84,824,000,000	79,246,000,000	24,859,000,000	22,386,000,000	71,620,000,000	64,625,000,000	4,416,000,000	4,468,000,000	13,204,000,000	14,621,000,000	2,785,000,000	2,633,000,000	7,984,000,000	7,559,000,000	1,462,000,000	874,000,000	4,286,000,000	2,542,000,000	784,000,000		738,000,000		2,374,000,000		2,206,000,000		658,000,000	598,000,000	1,975,000,000	1,777,000,000	107,000,000	120,000,000	338,000,000	357,000,000	19,000,000	20,000,000	61,000,000	72,000,000
Operating profit (2) (3) (4) (5)					589,000,000	617,000,000	2,125,000,000	1,920,000,000	552,000,000	[2],[3],[4],[5]	525,000,000	[2],[3],[4],[5]	1,856,000,000	[2],[3],[4],[5]	1,646,000,000	[2],[3],[4],[5]																					37,000,000	[6]	92,000,000	[6]	269,000,000	[6]	274,000,000	[6]													(112,000,000)	[7]	(109,000,000)	[7]	(307,000,000)	[7]	(212,000,000)	[7]
Interest Expense	(69,000,000)	(59,000,000)	(187,000,000)	(170,000,000)
Income Before Income Taxes from Continuing Operations	408,000,000	449,000,000	1,631,000,000	1,538,000,000
Document Fiscal Year Focus			2014
Gain on business combination	$ 0	$ 0	$ 0	$ 81,000,000																																																											$ 81,000,000								$ 81,000,000
Currently acquired percentage of building																																																																								50.00%
Percentage of Revenue Derived From Services									less than 2%		less than 2%		less than 2%		less than 2%
Percentage of service revenue																																																																													2.00%	2.00%	2.00%	2.00%

[1] Revenues derived from services represent less than 2% of this segment’s total revenues.

[2] Operating profit for the third quarter and first nine months of 2014 includes the receipt of $27 million and $34 million and for the third quarter and first nine months of fiscal year 2013 the receipt of $8 million and $27 million representing our share of settlements of antitrust class action lawsuits brought against drug manufacturers, which was recorded as a reduction to cost of sales.

[3] Operating profit for the third quarter and first nine months of 2014 includes last-in-first-out (“LIFO”) charges of $142 million and $186 million and, for the third quarter and first nine months of 2013 includes LIFO charges of $2 million and $5 million, which were recorded in cost of sales.

[4] Operating profit for the third quarter and first nine months of 2013 includes a $40 million charge for a legal dispute in our Canadian business, which was recorded in operating expenses.

[5] Operating profit for the third quarter of 2014 includes AWP litigation charges of $18 million and for the first nine months of 2014 and 2013 includes AWP litigation charges of $68 million and $60 million, which were recorded in operating expenses.

[6] Technology Solutions segment results for the third quarter of 2014 include product alignment charges, integration-related expenses and reduction-in-workforce severance charges totaling $57 million, of which $34 million was recorded in cost of sales and $23 million was recorded in operating expenses. This segment’s results for the first nine months of 2014 include product alignment charges, integration-related expenses and reduction-in-workforce severance charges totaling $60 million, of which $34 million was recorded in cost of sales and $26 million was recorded in operating expenses.

[7] Corporate expenses, net for the third quarter and first nine months of 2014 include $25 million of acquisition-related expenses and for the first nine months of 2013 are net of an $81 million pre-tax gain on business combination related to the acquisition of the remaining 50% ownership interest in our corporate headquarters building.