Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended			9 Months Ended
	Oct. 23, 2018	Oct. 01, 2018	Aug. 31, 2018	Feb. 28, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Acquisitions, net of cash acquired						$ 770	$ 712
Invuity | Subsequent Event
Business Acquisition [Line Items]
Acquisitions, net of cash acquired	$ 230
Consideration transferred (in dollars per share)	$ 7.40
HyperBranch | Subsequent Event
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ 220
K2M
Business Acquisition [Line Items]
Acquisitions, net of cash acquired			$ 1,400
Consideration transferred (in dollars per share)			$ 27.50
Entellus
Business Acquisition [Line Items]
Acquisitions, net of cash acquired				$ 697
Consideration transferred (in dollars per share)				$ 24.00
NOVADAQ
Business Acquisition [Line Items]
Acquisitions, net of cash acquired					$ 674