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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended
	Mar. 31, 2019	Aug. 31, 2018	Feb. 28, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Acquisitions, net of cash acquired				$ 180	$ 704
Acquisition and integration-related charges				$ 138	$ 17
OrthoSpace, Ltd.
Business Acquisition [Line Items]
Acquisitions, net of cash acquired	$ 110
Future milestone payments	$ 110
K2M
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ 1,380
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

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- Definition

Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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