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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 13, 2019 $ / shares | Dec. 13, 2019 € / shares | Nov. 30, 2019 USD ($) $ / shares | Oct. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of acquisitions |  |  |  |  |  | $ 26 | $ 425
Acquisitions, net of cash acquired |  |  |  |  |  | $ 26 | $ 260
Mobius |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of acquisitions |  |  |  | $ 360 |  |  |
Future milestone payments |  |  |  | $ 130 |  |  |
OrthoSpace, Ltd. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of acquisitions |  |  |  |  | $ 110 |  |
Future milestone payments |  |  |  |  | $ 110 |  |
Wright |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred (in dollars per share) | $ / shares | $ 30.75 |  | $ 30.75 |  |  |  |
Acquisitions, net of cash acquired |  |  | $ 5,400 |  |  |  |
Par value of ordinary shares of acquiree (in dollars per share) | € / shares |  | € 0.03 |  |  |  |  |

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