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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 |  |

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