| **Fair Value Measurements - Unobservable Input Reconciliation of Contingent Consideration Liability (Details) - Fair Value, Inputs, Level 3 - Contingent Consideration Liabilities - USD ($) $ in Millions** | 3 Months Ended |
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| **Contingent Consideration Liability [Roll Forward]**                                                                                                                                                        |           |   |
| Beginning balance                                                                                                                                                                                            | $ 27           | $ 50 |
| Change in fair value of contingent consideration                                                                                                                                                             | (18)           | (23) |
| Initial fair value measurement of contingent consideration                                                                                                                                                   | 155            |   |
| Ending balance                                                                                                                                                                                               | 164            | 27 |
| Spinal Modulation                                                                                                                                                                                            |           |   |
| **Contingent Consideration Liability [Roll Forward]**                                                                                                                                                        |           |   |
| Beginning balance                                                                                                                                                                                            | 0              | 0 |
| Change in fair value of contingent consideration                                                                                                                                                             | 5              | 0 |
| Initial fair value measurement of contingent consideration                                                                                                                                                   | 155            |   |
| Ending balance                                                                                                                                                                                               | 160            | 0 |
| Nanostim                                                                                                                                                                                                     |           |   |
| **Contingent Consideration Liability [Roll Forward]**                                                                                                                                                        |           |   |
| Beginning balance                                                                                                                                                                                            | 27             | 50 |
| Change in fair value of contingent consideration                                                                                                                                                             | (23)           | (23) |
| Initial fair value measurement of contingent consideration                                                                                                                                                   | 0              |   |
| Ending balance                                                                                                                                                                                               | $ 4            | $ 27 |

| X                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Contingent Consideration Arrangements, Initial Fair Value Measurement
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contingent Consideration Liability [Roll Forward]
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258
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| X                                                                                                                                                                          |
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| X                                                                                                                                                                        |
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| X                                                                                                                                                  |
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| X                                                                                                                                          |
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