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Business Combinations and Divestitures (Details) - USD ($) |  | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | ---
Jun. 16, 2017 | Apr. 01, 2018 | Apr. 02, 2017 | Oct. 01, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from Sale of Productive Assets |  | $ 20,000,000 | $ 31,000,000 |  |
Goodwill |  | 31,149,000,000 |  |  | $ 31,906,000,000
Payments to acquire businesses |  | 82,000,000 | 4,852,000,000 |  |
Asset write-downs |  | 0 | $ 37,000,000 |  |
Medical Devices |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 12,994,000,000 |  |  | $ 13,922,000,000
Patents And Trademarks |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent |  | 600,000,000 |  |  |
Actelion |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Subsequent Recognition of Deferred Tax Asset |  |  |  | $ 200,000,000 |
Business Combination, Initial Accounting Incomplete, Adjustment, Current Liabilities |  |  |  | $ 400,000,000 |
Goodwill | $ 5,986,000,000 | 6,161,000,000 |  |  |
Business Acquisition, Share Price | $ 280 |  |  |  |
Payments to acquire businesses | $ 29,600,000,000 |  |  |  |
Weighted average useful life | 9 years |  |  |  |
Business Combination, Acquisition Related Costs |  | 100,000,000 |  |  |
Actelion | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years |  |  |  |
Actelion | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |
Actelion | In-process research and development |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair Value Inputs, Discount Rate | 9.00% |  |  |  |
Idorsia |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 9.90% |  |  |  |
Convertible Note, Equity Interest, Percentage | 22.10% |  |  |  |
Idorsia | Convertible Debt |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Long-term Debt | $ 500,000,000 |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |
Idorsia | Line of Credit |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 250,000,000 |  |  |  |
Idorsia | Debt Instrument, Redemption, Period One | Convertible Debt |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Convertible Note, Equity Interest, Percentage | 16.00% |  |  |  |
Debt Instrument, Restrictive Covenants, Shareholder Ownership Threshold, Percent | 20.00% |  |  |  |
AMO |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life |  |  | 14 years 4 months 24 days |  |
AMO | Medical Devices |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,700,000,000 |  |
Payments to acquire businesses |  |  | 4,300,000,000 |  |
Total amortizable intangibles |  |  | $ 2,300,000,000 |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale | LifeScan |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Disposal group consideration |  | 2,100,000,000 |  |  |
Disposal group inventory |  | 100,000,000 |  |  |
Disposal group property, plant and equipment |  | 200,000,000 |  |  |
Disposal group intangible assets |  | 100,000,000 |  |  |
Disposal group goodwill |  | 1,000,000,000 |  |  |
Assets held for sale, current |  | 100,000,000 |  |  |
Valchlor |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent |  | 400,000,000 |  |  |
Valchlor | Patents And Trademarks |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent |  | $ 500,000,000 |  |  |

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