Segment Information (Assets by Reportable Segment) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total assets	$ 41,031	$ 40,112
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total assets	20,573	21,848
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total assets	17,746	10,688
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 2,712	$ 7,576