| **Accumulated Other Comprehensive Income (Loss) and Supplemental Equity Information (Details) - USD ($) $ / shares in Units, shares in Millions** |        | 1 Months Ended | 3 Months Ended | 9 Months Ended |                |        |
|---------------------------------------------------------------------------------------------------------------------------------------------------|--------|----------------|----------------|----------------|----------------|--------|
||
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                                          |   |           |           |           |           |   |   |   |   |
| Cash dividends declared per share (USD per share)                                                                                                 | $ 0.31 |           | $ 0.31         | $ 0.29         |           | $ 0.93 | $ 0.87 |   |   |
| Authorized amount                                                                                                                                 |   |           |           |           |           |   |   | $ 500,000,000 |   |
| Shares repurchased, shares                                                                                                                        |   | 7.5            |           |           |           |   |   |   |   |
| Shares repurchased, value                                                                                                                         |   | $ 500,000,000  |           |           |           |   | $ 500,000,000 |   |   |
| Average repurchase price (USD per share)                                                                                                          |   | $ 66.96        |           |           |           |   |   |   |   |
| **Business Combination, Separately Recognized Transactions [Line Items]**                                                                         |   |           |           |           |           |   |   |   |   |
| Additions (purchases) of noncontrolling ownership interests                                                                                       |   |           |           |           |           |   | $ 330,000,000 |   |   |
| Spinal Modulation                                                                                                                                 |   |           |           |           |           |   |   |   |   |
| **Business Combination, Separately Recognized Transactions [Line Items]**                                                                         |   |           |           |           |           |   |   |   |   |
| Equity investment                                                                                                                                 |   |           |           |           |           |   |   |   | $ 40,000,000 |
| Voting equity interest                                                                                                                            |   |           |           |           |           |   |   |   | 19.00% |
| Additions (purchases) of noncontrolling ownership interests                                                                                       |   |           |           |           | $ 173,000,000  |   |   |   |   |
| Ownership percentage by noncontrolling owners                                                                                                     |   |           |           |           | 81.00%         |   |   |   |   |
| Contingent consideration                                                                                                                          |   |           |           |           | $ 155,000,000  |   |   |   |   |
| Increase (decrease) in stockholders' equity                                                                                                       |   |           |           |           | (297,000,000)  |   |   |   |   |
| Increase (decrease) in noncontrolling interest                                                                                                    |   |           |           |           | $ (33,000,000) |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity Security Ownership Interest And Allocated Value For Purchase Option
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of asset recognized arising from contingent consideration in a business combination.
+ References
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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.
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No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate dividends declared during the period for each share of common stock outstanding.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).
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| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.
+ References
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| - Definition
The parent entity's interest in net assets of the subsidiary, expressed as a percentage.
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| - Definition
Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.
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| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The increase (decrease) in stockholders' equity during the period.
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| - Definition
Total cost of shares repurchased divided by the total number of shares repurchased.
+ References
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