Segment Information (Assets by Reportable Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total assets	$ 42,905	$ 40,112
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total assets	23,014	21,848
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total assets	17,993	10,688
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 1,898	$ 7,576