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Segments of Business (Details) $ in Millions, $ in Millions			3 Months Ended
	May 23, 2018 USD ($)	May 23, 2018 CAD ($)	Jun. 30, 2018 USD ($) country segment	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)
Revenues
Total Revenues			$ 52,607	$ 51,051
Operating profit
Total operating profit			83	633
Corporate Expenses, Net			(123)	(109)
Interest Expense			(61)	(68)
Income from Continuing Operations Before Income Taxes			$ 6	458
Number of reportable segments | segment			3
Pre-tax (credits) charges related to LIFO accounting			$ (21)	26
Goodwill and asset impairment charges			570	0
U.S. Pharmaceutical and Specialty Solutions
Operating profit
Pre-tax (credits) charges related to LIFO accounting			(21)	26
Goodwill and asset impairment charges			$ 0
European Pharmaceutical Solutions
Operating profit
Number of countries in which entity segment operates | country			13
Goodwill and asset impairment charges			$ 570
Medical-Surgical Solutions
Operating profit
Goodwill and asset impairment charges			0
Other
Operating profit
Goodwill and asset impairment charges			0
Operating Segments
Revenues
Total Revenues			52,607	51,051
Operating profit
Total operating profit			$ 190	$ 635
Revenue derived from services, percentage (less than)			1.00%	1.00%
Operating Segments | U.S. Pharmaceutical and Specialty Solutions
Revenues
Total Revenues			$ 40,977	$ 40,282
Operating profit
Total operating profit			543	475
Proceeds from legal settlements			35
Operating Segments | European Pharmaceutical Solutions
Revenues
Total Revenues			6,935	6,382
Operating profit
Total operating profit			$ (560)	$ 35
Revenue derived from services, percentage (less than)			10.00%	10.00%
Goodwill and asset impairment charges			$ 570
Operating Segments | Medical-Surgical Solutions
Revenues
Total Revenues			1,703	$ 1,533
Operating profit
Total operating profit			$ 93	$ 108
Revenue derived from services, percentage (less than)			1.00%	1.00%
Operating Segments | Other
Revenues
Total Revenues			$ 2,992	$ 2,854
Operating profit
Total operating profit			$ 114	$ 17
Joint Venture | Change Healthcare, LLC (“Change Healthcare”)
Operating profit
Ownership interest in the joint venture (percent)			70.00%	70.00%
Core MTS Businesses | Change Healthcare, LLC (“Change Healthcare”) | Operating Segments | Other
Operating profit
Gain from sale of business, pre-tax				$ 37	$ 3,947
Gain from sale of business, after tax				22	$ 3,018
Core MTS Businesses | Joint Venture
Operating profit
Ownership interest in the joint venture (percent)			70.00%
United States
Revenues
Total Revenues			$ 42,890	42,093
Foreign
Revenues
Total Revenues			9,717	$ 8,958
Third Party Seller of Rexall Health | Rexall Health | CANADA
Operating profit
Net restructuring charges recognized			97
Proceeds from prior acquisitions	$ 97	$ 125
Strategic Growth Initiative Plan
Operating profit
Net restructuring charges recognized			58
Strategic Growth Initiative Plan | U.S. Pharmaceutical and Specialty Solutions
Operating profit
Net restructuring charges recognized			8
Strategic Growth Initiative Plan | Medical-Surgical Solutions
Operating profit
Net restructuring charges recognized			12
Strategic Growth Initiative Plan | Other
Operating profit
Net restructuring charges recognized			38
Net restructuring charges recognized, after tax			$ 38

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