| **Fair Value Measurements - Summary of Level 3 Fair Value Measurements of Contingent Consideration (Details) - Fair Value, Inputs, Level 3 - USD ($) $ in Millions** | 3 Months Ended |        |        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|--------|--------|
||
| Contingent Consideration Liabilities                                                                                                                                 |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Contingent Consideration Liabilities                                                                                                                                 | $ 36           | $ 151  | $ 50   |
| Spinal Modulation | Contingent Consideration Liabilities                                                                                                             |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Contingent Consideration Liabilities                                                                                                                                 | $ 6            | 122    | 0      |
| Spinal Modulation | Monte Carlo Simulation                                                                                                                           |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Expected revenue volatility                                                                                                                                          | 25.00%         |   |   |
| Spinal Modulation | Monte Carlo Simulation | Minimum                                                                                                                 |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Discount Rate                                                                                                                                                        | 0.90%          |   |   |
| Spinal Modulation | Monte Carlo Simulation | Maximum                                                                                                                 |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Discount Rate                                                                                                                                                        | 16.00%         |   |   |
| Spinal Modulation | Monte Carlo Simulation | Contingent Consideration Liabilities                                                                                    |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Contingent Consideration Liabilities                                                                                                                                 | $ 6            |   |   |
| Nanostim | Contingent Consideration Liabilities                                                                                                                      |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Contingent Consideration Liabilities                                                                                                                                 | $ 2            | 2      | 50     |
| Nanostim | Probability Weighted Discounted Cash Flow                                                                                                                 |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Discount Rate                                                                                                                                                        | 5.00%          |   |   |
| Probability of Payments                                                                                                                                              | 10.00%         |   |   |
| Nanostim | Probability Weighted Discounted Cash Flow | Contingent Consideration Liabilities                                                                          |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Contingent Consideration Liabilities                                                                                                                                 | $ 2            |   |   |
| Thoratec | Contingent Consideration Liabilities                                                                                                                      |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Contingent Consideration Liabilities                                                                                                                                 | $ 28           | $ 27   | $ 0    |
| Thoratec | Probability Weighted Discounted Cash Flow                                                                                                                 |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Discount Rate                                                                                                                                                        | 4.90%          |   |   |
| Thoratec | Probability Weighted Discounted Cash Flow | Minimum                                                                                                       |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Probability of Payments                                                                                                                                              | 0.00%          |   |   |
| Thoratec | Probability Weighted Discounted Cash Flow | Maximum                                                                                                       |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Probability of Payments                                                                                                                                              | 90.00%         |   |   |
| Thoratec | Probability Weighted Discounted Cash Flow | Contingent Consideration Liabilities                                                                          |           |   |   |
| **Fair Value Inputs, Assets, Quantitative Information [Line Items]**                                                                                                 |           |   |   |
| Contingent Consideration Liabilities                                                                                                                                 | $ 28           |   |   |

| X                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expected revenue volatility
+ References
No definition available.
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| - Definition
Probability of Payment
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - Definition
Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value.  For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.
+ 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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