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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 831 | $ 4,332 | $ 153
Net sales |  |  | $ 3,471 | $ 3,006 | $ 3,012 | $ 2,955 | $ 3,157 | $ 2,833 | $ 2,840 | $ 2,495 | $ 12,444 | 11,325 | $ 9,946
Entellus Medical, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | $ 75 |
Entellus Medical, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired | $ 662 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, share price | $ 24.00 |  | $ 24.00 |  |  |  |  |  |  |  | $ 24.00 |  |
NOVADAQ Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  | $ 716 |  |  |  |  |  |  |  |  |  |  |

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