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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Acquisitions, net of cash acquired |  |  | $ 704 | $ 9 |
Net sales |  |  | 3,241 | $ 2,955 |
Entellus |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisitions, net of cash acquired |  |  | $ 697 |  |
Consideration transferred (in dollars per share) | $ 24.00 |  |  |  |
Cash acquired from acquisition | $ 697 |  |  |  |
NOVADAQ |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisitions, net of cash acquired |  | $ 674 |  |  | $ 674

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