Acquisitions (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended
	Oct. 02, 2015 USD ($) country	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2016 USD ($)
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired				$ 11	$ 3,284
Goodwill		$ 7,212		7,212		$ 7,167
Goodwill, Acquired During Period				70
Cordis
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired	$ 1,900
Number of countries in which the entity operates | country	50
Number of principal countries | country	20
Transaction and integration costs		15	$ 20	29	$ 41
Goodwill		944		944
Goodwill, Acquired During Period				83
naviHealth
Business Acquisition [Line Items]
Goodwill		322		322
Harvard Drug
Business Acquisition [Line Items]
Goodwill		$ 634		$ 634