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Acquisitions, Divestitures, Research Collaborations and Licensing Agreements - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 02, 2021 | Jul. 31, 2024 USD ($) aqua_facility candidate | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jan. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) jurisdiction | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) jurisdiction | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Oct. 31, 2023 USD ($) candidate | Feb. 28, 2023 candidate
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  | $ 3,500 | $ 13,321 | $ 7,492 | $ 17,597 |  |  |
Sales |  |  |  |  |  |  | 16,112 | 15,035 | 31,887 | 29,522 |  |  |
Cost of sales |  |  |  |  |  |  | 3,745 | 4,024 | 7,285 | 7,951 |  |  |
Other current assets |  |  |  |  |  |  | 8,740 |  | 8,740 |  | $ 8,368 |  |
Accrued and other current liabilities |  |  |  |  |  |  | 14,712 |  | 14,712 |  | 15,766 |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  |  |  |  |  |  | 557 |  | 557 |  | 632 |  |
Accrued and other current liabilities |  |  |  |  |  |  | 102 |  | 102 |  | $ 598 |  |
Manufacturing and Supply Agreements | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  | 93 | 96 | 201 | 191 |  |  |
Cost of sales |  |  |  |  |  |  | $ 92 | 101 | $ 202 | 208 |  |  |
Minimum | Manufacturing and Supply Agreements | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Period of continuing involvement after disposal | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Manufacturing and Supply Agreements | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Period of continuing involvement after disposal | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Organon & Co. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of jurisdictions remaining | jurisdiction |  |  |  |  |  |  | 1 |  | 1 |  |  |  |
Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of antibody drug conjugates obtained right and obligations | candidate |  |  |  |  |  |  |  |  |  |  |  |  | 7
Upfront payment made to collaborative partner |  |  |  | $ 175 |  |  |  | 175 |  | 175 |  |  |
Number of antibody drug conjugates terminated with collaborative partner | candidate |  |  |  |  |  |  |  |  |  |  |  | 2 |
Eligible future contingent development-related payments (up to) |  |  |  |  |  |  |  |  |  |  |  | $ 540 |
Eligible future contingent regulatory milestone payments (up to) |  |  |  |  |  |  |  |  |  |  |  | 1,500 |
Eligible future contingent sales-based milestone payments (up to) |  |  |  |  |  |  |  |  |  |  |  | $ 3,100 |
Stock investment in counterparty |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
Harpoon Therapeutics, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, asset acquisition |  |  | $ 765 |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  | $ 656 |  |  |  |
Asset acquisition, transaction costs |  |  | 56 |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  | $ 165 |  |  |  |  |  |  |  |  |  |
Prometheus Biosciences, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, asset acquisition |  |  |  | 11,000 |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  | $ 10,200 |  | 10,200 |  |  |
Net assets acquired |  |  |  | 877 |  |  |  |  |  |  |  |  |
Consideration transferred, to settle share-based equity awards |  |  |  | 1,200 |  |  |  |  |  |  |  |  |
Consideration transferred, to settle equity awards, unvested |  |  |  | 700 |  |  |  |  |  |  |  |  |
Cash recorded for asset acquisition |  |  |  | 368 |  |  |  |  |  |  |  |  |
Investments recorded for asset acquisition |  |  |  | 296 |  |  |  |  |  |  |  |  |
Deferred tax assets recorded for asset acquisition |  |  |  | 218 |  |  |  |  |  |  |  |  |
Other net liabilities recorded for asset acquisition |  |  |  | $ 5 |  |  |  |  |  |  |  |  |
Imago Bio Sciences, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, asset acquisition |  |  |  |  | 1,350 |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |
Asset acquisition, transaction costs |  |  |  |  | 60 |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  | $ 219 |  |  |  |  |  |  |  |
Forecast | Eyebiotech Limited |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  | $ 1,300 |  |  |  |  |  |  |
Subsequent Event | Orion |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Eligible future contingent development-related payments (up to) |  | $ 30 |  |  |  |  |  |  |  |  |  |  |
Eligible future contingent regulatory milestone payments (up to) |  | 625 |  |  |  |  |  |  |  |  |  |  |
Eligible future contingent sales-based milestone payments (up to) |  | $ 975 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of exercised license option antibody drug conjugates | candidate |  | 1 |  |  |  |  |  |  |  |  |  |  |
Number of licensed antibody drug conjugates | candidate |  | 3 |  |  |  |  |  |  |  |  |  |  |
Number of unexercised license option antibody drug conjugates | candidate |  | 1 |  |  |  |  |  |  |  |  |  |  |
Payment resulting from the license option exercise |  | $ 38 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Eyebiotech Limited |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, asset acquisition |  | 1,300 |  |  |  |  |  |  |  |  |  |  |
Potential developmental, regulatory and commercial milestone payments |  | 1,700 |  |  |  |  |  |  |  |  |  |  |
Elanco Animal Health Incorporated Aqua Business | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  | $ 1,300 |  |  |  |  |  |  |  |  |  |  |
Aqua manufacturing facilities | aqua_facility |  | 2 |  |  |  |  |  |  |  |  |  |  |

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