Segments of Business - Segment Assets and Property, Plant and Equipment, Net by Geographical Area (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Segment assets
Total	$ 61,247	$ 59,672
Property, plant and equipment, net
Total	2,365	2,548
United States
Property, plant and equipment, net
Total	1,642	1,698
Foreign
Property, plant and equipment, net
Total	723	850
Operating Segments | U.S. Pharmaceutical and Specialty Solutions
Segment assets
Total	34,927	32,310
Operating Segments | European Pharmaceutical Solutions
Segment assets
Total	9,499	7,829
Operating Segments | Medical-Surgical Solutions
Segment assets
Total	5,395	5,260
Operating Segments | Other
Segment assets
Total	7,944	11,006
Corporate
Segment assets
Total	$ 3,482	$ 3,267