Acquisitions (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jul. 29, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired				$ 21	$ 6,141
Goodwill		$ 8,317		8,317		$ 8,316
Goodwill, Acquired During Period				15
Patient Recovery Business
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired	$ 6,100
Transaction and integration costs		22	$ 24	44	$ 61
Goodwill		$ 3,300		$ 3,300