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Restructuring - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jul. 02, 2017 USD ($) | Apr. 02, 2017 USD ($) | Jan. 01, 2017 USD ($) | Oct. 02, 2016 USD ($) | Jul. 03, 2016 USD ($) | Apr. 03, 2016 USD ($) | Dec. 31, 2017 USD ($) Employee | Jan. 01, 2017 USD ($) | Jan. 03, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 309 | $ 491 | $ 509
Medical Devices |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring related charge |  |  |  |  |  |  |  |  | 760 |  |
Restructuring charges | $ 284 | $ 187 | $ 128 | $ 161 | $ 298 | $ 109 | $ 141 | $ 137 | 850 | $ 685 | $ 590
Restructuring costs incurred since announced | 2,000 |  |  |  |  |  |  |  | $ 2,000 |  |
Number of positions eliminated | Employee |  |  |  |  |  |  |  |  | 2,400 |  |
Medical Devices | Cost of products sold |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 88 |  |
Medical Devices | Other Income Expense Net |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 363 |  |
Medical Devices | Severance |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax restructuring charges | 400 |  |  |  |  |  |  |  | 400 |  |
Minimum | Medical Devices |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax restructuring charges | 2,000 |  |  |  |  |  |  |  | $ 2,000 |  |
Percent of workforce eliminated |  |  |  |  |  |  |  |  | 4.00% |  |
Maximum | Medical Devices |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax restructuring charges | $ 2,400 |  |  |  |  |  |  |  | $ 2,400 |  |
Percent of workforce eliminated |  |  |  |  |  |  |  |  | 6.00% |  |
Medical Devices |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period of workforce reduction |  |  |  |  |  |  |  |  | 15 months |  |
Number of positions eliminated and receiving severance payments | Employee |  |  |  |  |  |  |  |  | 1,700 |  |

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