Segment Information Disaggregated Revenue Within Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 39,065	$ 37,341
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	39,069	37,345
Operating Segments | Pharmaceutical
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	35,112	33,428
Operating Segments | Pharmaceutical | Nuclear Precision Health Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	196	216
Operating Segments | Pharmaceutical | Pharmaceutical Distribution and Specialty [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	34,916	33,212
Operating Segments | Medical
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	3,957	3,917
Operating Segments | Medical | Medical distribution and products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	3,438	3,446
Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (4)	$ (4)