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Segment and Geographic Data Segment and Geographic Data (Segment Information) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Assets | $ 27,229 | $ 22,197 | $ 20,435
Capital Expenditures During Period | 572 | 598 | 490
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 26,550 | 21,350 | 19,730
Capital Expenditures During Period | 382 | 382 | 307
Operating Segments | Orthopaedics |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 8,873 | 7,486 | 7,048
Capital Expenditures During Period | 134 | 138 | 153
Operating Segments | MedSurg |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 10,417 | 9,759 | 8,553
Capital Expenditures During Period | 217 | 194 | 129
Operating Segments | Neuro and Spine |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 7,260 | 4,105 | 4,129
Capital Expenditures During Period | 31 | 50 | 25
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 679 | 847 | 705
Capital Expenditures During Period | $ 190 | $ 216 | $ 183

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