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Business Combinations and Divestitures - Narrative (Details) - USD ($) |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 16, 2017 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Oct. 01, 2017 | Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016 | Dec. 30, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 10,000,000,000 |  |  |  |  | $ 10,000,000,000 |  |  |
Goodwill |  | 31,906,000,000 |  |  |  |  | 31,906,000,000 | $ 22,805,000,000 | $ 21,629,000,000 |
Acquisition payments |  |  |  |  |  |  | 35,151,000,000 | 4,509,000,000 | 954,000,000 |
Acquisition related costs |  | 217,000,000 |  |  |  |  |  |  |  |
Liabilities assumed |  |  |  |  |  |  | 1,786,000,000 | 77,000,000 | 220,000,000 |
Contingent consideration |  |  |  |  |  |  |  |  | 210,000,000 |
Indefinite lived intangible assets |  | 11,283,000,000 |  |  |  |  | 11,283,000,000 | 10,331,000,000 |  |
Purchase price |  |  |  |  |  |  | 35,151,000,000 | 4,509,000,000 | 954,000,000 |
Asset write-downs |  |  |  |  |  |  | 795,000,000 | 283,000,000 | 624,000,000 |
Gain on divestitures, pre-tax |  |  |  |  |  |  | 1,300,000,000 | 600,000,000 | 2,600,000,000 |
2017 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price over fair value of assets acquired |  | 34,379,000,000 |  |  |  |  | 34,379,000,000 |  |  |
2016 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price over fair value of assets acquired |  |  |  |  |  |  |  | $ 4,077,000,000 |  |
Vogue International LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  | 22 years |  |
Actelion |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory | $ 642,000,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 6,161,000,000 |  |  |
Acquisition payments |  |  |  |  |  |  | 29,600,000,000 |  |  |
Acquisition price (in dollars per share) | $ 280 |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 9 years |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | 1,400,000,000 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | (1,400,000,000) |  |  |
Acquisition related costs |  |  | $ 367,000,000 | $ 213,000,000 |  |  | 800,000,000 |  |  |
Idorsia [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 9.90% |  |  |  |  |  |  |  |  |
Convertible Note, Equity Interest, Percentage | 22.10% |  |  |  |  |  |  |  |  |
AMO |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 14 years 4 months 24 days |  |  |  |  |
Acquisition related costs |  |  |  |  | $ 38,000,000 |  |  |  |  |
2015 acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price over fair value of assets acquired |  |  |  |  |  |  |  |  | $ 1,173,000,000 |
XO1 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Probability of success (as a percent) |  |  |  |  |  |  |  |  | 36.00% |
Discount rate (as a percent) |  |  |  |  |  |  |  |  | 11.75% |
Synthes, Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | $ 20,200,000,000
In Process Research and Development [Member] | Actelion |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Discount Rate | 9.00% |  |  |  |  |  |  |  |  |
Purchased in-process research and development |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets |  | 4,201,000,000 |  |  |  |  | 4,201,000,000 | $ 3,443,000,000 |  |
Purchased in-process research and development | XO1 and Novira Therapeutics |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets |  |  |  |  |  |  |  |  | $ 839,000,000 |
Purchased in-process research and development | XO1 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets |  |  |  |  |  |  |  |  | 360,000,000 |
Purchased in-process research and development | Novira |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets |  |  |  |  |  |  |  |  | $ 396,000,000 |
Probability of success (as a percent) |  |  |  |  |  |  |  |  | 51.00% |
Discount rate (as a percent) |  |  |  |  |  |  |  |  | 16.00% |
Medical Devices |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | 13,922,000,000 |  |  |  |  | 13,922,000,000 | 11,702,000,000 | $ 11,500,000,000 |
Asset write-downs |  |  |  | $ 182,000,000 |  |  | 215,000,000 |  | 346,000,000 |
Medical Devices | AMO |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | 1,700,000,000 |  |  | 1,700,000,000 |  | 1,700,000,000 |  |  |
Acquisition payments |  |  |  |  | 4,300,000,000 |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | $ 2,300,000,000 |  | 2,300,000,000 |  |  |
Acquisition related costs |  |  |  |  |  |  | 140,000,000 |  |  |
Consumer |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | 8,875,000,000 |  |  |  |  | 8,875,000,000 | 8,263,000,000 | $ 7,240,000,000 |
Consumer | Vogue International LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition payments |  |  |  |  |  |  |  | 3,300,000,000 |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  | 2,300,000,000 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  |  | $ 1,100,000,000 |  |
Maximum | Actelion |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |  |  |  |  |  |
Minimum | Actelion |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years |  |  |  |  |  |  |  |  |
In Process Research and Development [Member] | 2017 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price over fair value of assets acquired |  | $ 1,139,000,000 |  |  |  |  | $ 1,139,000,000 |  |  |
Trademarks | Vogue International LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 22 years |  |
Trademarks | Maximum | Vogue International LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 22 years |  |
Trademarks | Minimum | Vogue International LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 10 years |  |
Line of Credit [Member] | Idorsia [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 250,000,000 |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | Idorsia [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt | $ 500,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One [Member] | Convertible Debt [Member] | Idorsia [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Restrictive Covenants, Shareholder Ownership Threshold, Percent | 20.00% |  |  |  |  |  |  |  |  |
Convertible Note, Equity Interest, Percentage | 16.00% |  |  |  |  |  |  |  |  |
Research and Development Expense [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  | 5.00% |  |  |

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