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Acquisitions and Divestitures - Narrative (Details) $ / shares in Units, shares in Millions, SFr in Millions, $ in Millions, ¥ in Billions |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2021 USD ($) | Oct. 01, 2020 USD ($) | Apr. 01, 2019 USD ($) | Jan. 17, 2019 USD ($) | Jan. 17, 2019 JPY (¥) | Sep. 27, 2020 USD ($) | Mar. 29, 2020 USD ($) | Mar. 31, 2019 USD ($) | Jan. 03, 2021 USD ($) $ / shares shares | Jan. 03, 2021 CHF (SFr) shares | Dec. 29, 2019 USD ($) | Dec. 30, 2018 USD ($) | Jan. 03, 2021 CHF (SFr) | Jan. 16, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 7,300 |  |  |  |  |
Liabilities assumed |  |  |  |  |  |  |  |  | 400 |  | $ 1,400 |  |  |
Goodwill |  |  |  |  |  |  |  |  | 36,393 |  | 33,639 | $ 30,453 |  |
Acquisition payments |  |  |  |  |  |  |  |  | 7,323 |  | 5,810 | 899 |  |
Other (income) expense, net |  |  |  |  |  |  |  |  | (2,899) |  | (2,525) | (1,405) |  |
Contingent consideration liability |  |  |  |  |  |  |  |  | 633 |  | 1,715 |  |  |
Liabilities assumed |  |  |  |  |  |  |  |  | 432 |  | 1,418 | 148 |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  |  | 1,200 |  |
In Process Research and Development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets, excluding goodwill |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
2019 Acquisitions | In Process Research and Development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price over fair value of assets acquired |  |  |  |  |  |  |  |  |  |  | 6,800 |  |  |
Auris Health |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed |  |  | $ 1,800 |  |  |  |  |  |  |  |  |  |  |
Intangible assets assumed |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition payments |  |  | 3,400 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 2,350 |  |  |  |  |  | 1,100 |  |  |  |  |
Marketable securities assumed |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |
2018 Acquisitions | In Process Research and Development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price over fair value of assets acquired |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |
Ci:z Holdings Co. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 2,100 | ¥ 230.0 |  |  |  |  |  |  |  |  |
Liabilities assumed |  |  |  |  |  |  |  |  | 400 |  |  |  |  |
Intangible assets assumed |  |  |  |  |  |  |  |  | 1,500 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |
Foreign currency exchange rate, translation |  |  |  |  |  |  |  |  |  |  |  |  |  | 109.06
Other (income) expense, net |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |
Weighted average useful life of acquired intangibles |  |  |  |  |  |  |  |  | 15 years 3 months 18 days | 15 years 3 months 18 days |  |  |  |
Idorsia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock (in USD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 28.55 |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  |  |  |  |  |  |  |  | 11.8 | 11.8 |  |  |  |
Sale of stock, percentage of ownership before transaction |  |  |  |  |  |  |  |  | 8.30% | 8.30% |  |  |  |
Proceeds from sale of available-for-sale securities, equity |  |  |  |  |  |  |  |  | $ 357 | SFr 337.0 |  |  |  |
Convertible note, equity Interest (in shares) | shares |  |  |  |  |  |  |  |  | 38.7 | 38.7 |  |  |  |
Convertible Note, equity interest, percentage |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |
Remaining borrowing capacity | SFr |  |  |  |  |  |  |  |  |  |  |  |  | SFr 243.0 |
Momenta |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 6,100 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |
Other assets assumed |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 13.00% |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |
Momenta | In Process Research and Development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets assumed |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |
2020 Acquisitions | In Process Research and Development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price over fair value of assets acquired |  |  |  |  |  |  |  |  | $ 7,500 |  |  |  |  |
bermekimab |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 800 |  |  |  |  |  |  |
Intangible assets assumed |  |  |  |  |  |  | $ 800 |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  | 16.00% |  |  |  |  |  |  |
Verb Surgical Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed |  |  |  |  |  |  |  |  | 300 |  |  |  |  |
Intangible assets assumed |  |  |  |  |  |  |  |  | 400 |  |  |  |  |
Other assets assumed |  |  |  |  |  |  |  |  | 200 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 200 |  |  |  |  |
Equity method investments, fair value |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |
Maximum | Auris Health |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of success factor |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |
Maximum | Momenta |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of success factor |  | 77.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum | bermekimab |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of success factor |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |
Minimum | Auris Health |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of success factor |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |
Minimum | Momenta |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of success factor |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Minimum | bermekimab |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probability of success factor |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Convertible Debt | Idorsia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | SFr |  |  |  |  |  |  |  |  |  |  |  |  | SFr 445.0 |
AdvancedSterilizationProducts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |
Evra and Doxil | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of brands | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale | LifeScan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  |  |  |  |  | $ 2,100 |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale | AdvancedSterilizationProducts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  |  |  |  | 2,800 |  |  |
Disposal group, including discontinued operation, cash |  |  |  |  |  |  |  |  |  |  | 2,700 |  |  |
Disposal group, including discontinued operation, receivables retained |  |  |  |  |  |  |  |  |  |  | 100 |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale | Supply Chain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, inventory, current |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |

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