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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Aug. 31, 2018 | Feb. 28, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  | $ 281 | $ 770 |
Acquisition and integration-related charges |  |  |  | $ 32 | $ 8 | 223 | $ 49 |
Goodwill |  |  |  | $ 8,704 |  | $ 8,704 |  | $ 8,563
OrthoSpace, Ltd. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired | $ 110 |  |  |  |  |  |  |
Future milestone payments | 110 |  |  |  |  |  |  |
Goodwill | $ 114 |  |  |  |  |  |  |
K2M |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  | $ 1,380 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 794
Consideration transferred (in dollars per share) |  | $ 27.50 |  |  |  |  |  |
Entellus |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  | $ 697 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 465
Consideration transferred (in dollars per share) |  |  | $ 24.00 |  |  |  |  |

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