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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Nov. 30, 2020 | Oct. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of acquisitions |  |  |  |  | $ 4,304 | $ 1,096 |
Purchase price of acquisitions, including convertible notes |  | $ 5,600 |  |  |  |  |
Repayments of long-term debt |  |  |  |  | $ 2,297 | $ 1,342 | $ 669
1.625% Convertible Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 1.625% |  |  |  |  |
Repayments of long-term debt |  | $ 864 |  |  |  |  |
2.25% Convertible Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Stated interest rate | 2.25% |  |  |  | 2.25% |  |
Repayments of long-term debt | $ 576 |  |  |  |  |  |
Mobius |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of acquisitions |  |  | $ 360 |  |  |  |
OrthoSpace, Ltd. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of acquisitions |  |  |  | $ 110 |  |  |
Future regulatory and commercial milestones |  |  |  | $ 110 |  |  |
Wright |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of acquisitions |  | $ 4,100 |  |  |  |  |
Consideration transferred, price per share (in dollars per share) |  | $ 30.75 |  |  |  |  |
Cardan Robotics |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Future regulatory and commercial milestones |  |  | $ 130 |  |  |  |

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