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Restructuring - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) Employee | Oct. 01, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 88 | $ 69 | $ 187 | $ 165
Supply Chain |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 89 |  |  |
Restructuring charges recorded to date | 100 |  | 100 |
Supply Chain | Cost of products sold |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 14 |  |  |
Supply Chain | Other (income) expense |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 34 |  |  |
Supply Chain | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring estimated cost | 1,900 |  | 1,900 |
Cost savings expected | 600 |  | 600 |
Supply Chain | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring estimated cost | 2,300 |  | 2,300 |
Cost savings expected | 800 |  | $ 800 |
Estimated cost settled with cash (as a percent) |  |  | 70.00% |
Medical Devices |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 101 |  | $ 473 |
Restructuring charges recorded to date | 2,400 |  | $ 2,400 |
Number of positions eliminated | Employee |  |  | 2,650 |
Number of positions eliminated and receiving severance | Employee |  |  | 1,950 |
Medical Devices | Cost of products sold |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 9 |  |  |
Medical Devices | Other (income) expense |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 45 |  |  |
Medical Devices | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Positions eliminated (as a percent) |  |  | 5.00% |
Medical Devices | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring estimated cost | 2,400 |  | $ 2,400 |
Medical Devices |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 200 | $ 200 | $ 400 | $ 500
Medical Devices | Supply Chain | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Period for activity |  |  | 4 years |
Medical Devices | Supply Chain | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Period for activity |  |  | 5 years |

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