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Segments of Business and Geographic Areas - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
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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 ($) Segment | Jan. 01, 2017 USD ($) Segment | Jan. 03, 2016 USD ($)
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of segments | Segment |  |  |  |  |  |  |  |  | 3 | 3 |
Acquisition related costs | $ 217 |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 309 | $ 491 | $ 509
Asset write-downs |  |  |  |  |  |  |  |  | 795 | 283 | 624
In-process research and development | 408 |  |  |  |  |  |  |  | 408 | 29 | 224
Litigation expense | 645 | $ 118 | $ 493 |  | $ 96 | $ 55 | $ 600 | $ 66 |  |  | 141
Gain from divestiture |  |  |  |  |  |  |  |  | 1,307 | 563 | 2,583
Medical Devices |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 284 | 187 | 128 | $ 161 | 298 | $ 109 | $ 141 | $ 137 | 850 | 685 | 590
Restructuring related charge |  |  |  |  |  |  |  |  | 760 |  |
Asset write-downs |  |  | 182 |  |  |  |  |  | 215 |  | 346
Integration costs |  |  |  |  |  |  |  |  |  |  | 196
Recall program |  |  |  |  |  |  |  |  |  |  | 148
In-process research and development |  |  |  |  |  |  |  |  |  |  | 10
Litigation expense |  |  |  |  |  |  |  |  | 1,139 | 806 | 5
Gain on litigation settlement |  |  |  |  |  |  |  |  |  |  | 600
Gain from divestiture |  |  |  |  |  |  |  |  | 700 |  | 1,300
Consumer |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gain from divestiture |  |  |  |  |  |  |  |  | 500 |  | 229
Pharmaceutical |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
In-process research and development |  |  |  |  |  |  |  |  | 396 | 29 | 214
Litigation expense |  |  |  |  |  |  |  |  | 117 |  | 136
Gain from divestiture |  |  |  |  |  |  |  |  |  |  | 981
Positive adjustment |  |  |  |  |  |  |  |  |  | 500 | $ 500
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 17,005 |  |  |  | 15,912 |  |  |  | 17,005 | 15,912 |
Other Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | $ 85,134 |  |  |  | $ 49,681 |  |  |  | 85,134 | $ 49,681 |
Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  | 12.50%
Actelion |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  | $ 367 | $ 213 |  |  |  |  |  | 800 |  |
Actelion | Pharmaceutical |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | 797 |  |
AMO |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  | $ 38 |  |  |  |  |  |  |
AMO | Medical Devices |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | $ 140 |  |
Wholesaler 1 | Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 14.00% | 13.50% |
Wholesaler 2 | Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |
Segment of Business and Geographic Areas (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 10.00% | 10.70% |

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