Segments of Business - Segment Assets and Property, Plant and Equipment, Net by Geographical Area (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Segment assets
Total	$ 59,672	$ 60,381
Property, plant and equipment, net
Total	2,548	2,464
United States
Property, plant and equipment, net
Total	1,698	1,529
Foreign
Property, plant and equipment, net
Total	850	935
Operating Segments | U.S. Pharmaceutical and Specialty Solutions
Segment assets
Total	32,310	31,431
Operating Segments | European Pharmaceutical Solutions
Segment assets
Total	7,829	10,467
Operating Segments | Medical-Surgical Solutions
Segment assets
Total	5,260	4,243
Operating Segments | Other
Segment assets
Total	11,006	11,509
Corporate
Segment assets
Total	$ 3,267	$ 2,731