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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2018 | Feb. 28, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  | $ 2,451 | $ 831 | $ 4,332
K2M |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions, net of cash acquired | $ 1,380 |  |  |  |  |
Consideration transfered, price per share (in dollars per share) | $ 27.50 |  |  |  |  |
Entellus |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions, net of cash acquired |  | $ 697 |  |  |  |
Consideration transfered, price per share (in dollars per share) |  | $ 24.00 |  |  |  |
NOVADAQ |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  | $ 674 |  |  |

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